EDIT3: April 15, 2015. New Poster
EDIT2: New Poster March 10th:
https://twitter.com/Digi_advntr15th/status/575299719934517248
Entire Digimon cast is returning, and the inserts song (Brave Heart) and the OP (Butterfly) coming back in a presumably new arrangement.
EDIT1: New Info Jan 14, thanks to Random One:
https://twitter.com/Digi_advntr15th/status/543742311834726401/photo/1
http://digimon-adventure.net/
Que the persona similarities.

On May 4th, 5th, and 6th they will re-air all of Adventure on niconico in Japan.
When that ends at 10:45pm on the 6th they will then show some tri. stuff including: a PV for the series/first episode, the rest of the voice cast and an airing schedule.
Edit- Here's a proper translation thanks to friend of the site TripleRach- On Wed. 5/6 at roughly 22:45, after the marathon completes, we'll have major news about "tri."! The PV for Part 1, chosen children and cast info, medium info, schedule... and other surprises!
-MarcFBR
Source
So I just noticed that the Digimon Adventure tri streams are region locked (thanks to a post on another Digimon website warning people against discussing how to bypass the region lock)
So instead I'm going to recommend people use hola if they wish to watch it. A chrome add-on.
Download Chrome if you don't have it, get hola unblocker (something I use for stuff like watching crunchyroll/US netflix), make sure you're logged into nico and then select hola -> Japan and it will make the website think you're from Japan.
Pretty sure this isn't against the rules here since we talk about it for netflix/CR/Steam a lot.
If you do that anyway, you can then watch the streams when they start in May![]()
EDIT2: New Poster March 10th:

https://twitter.com/Digi_advntr15th/status/575299719934517248
Entire Digimon cast is returning, and the inserts song (Brave Heart) and the OP (Butterfly) coming back in a presumably new arrangement.
EDIT1: New Info Jan 14, thanks to Random One:
Hourglassmon at withthewill forums said:He translated it into Spanish.
Luckily I'm Portuguese and Spanish gets pretty close.
He didn't translate every text we know of, basically the main interview.
I'm trusting this translation more than I trust automated ones for obvious reasons. He says that he's fairly confident with the translation and revised several times before publishing it. He warns that some Kanji were difficult to read so there might be a mistake here and there.
I'll take the time to translate it into English, but this doesn't make it the best translation we could get from the Japanese.
Some sentences in Spanish don't make grammatical sense to me. Inevitably, I may be getting a step or two away from the original Japanese to get some meaning out of those peculiarities. I'll do my best at interpreting what's there.
You do get a much better sense of Arai's answers and I think that's what most people care about.
----
As the title and the image show, the broadcasting of Digimon Adventure's 15 Anniversary Project is going to happen!
We asked several questions to producer Shuhei Arai about what he has in mind and to comment on what's been announced up to this point.
The title of this new work is Digimon Adventure Tri. What meaning does this have?
"Tri" is a reference to the number "3". But who knows, maybe in the script ("text" in Spanish) the "3" can be a key word? You could say that's what it means. Of course it's also a reference to the fact that it's the third entry. Without a doubt, people will have to pay attention to the many 3's that are in the script.
Please give us some details about this new work that takes place 15 years after the first generation of Digimon Adventure.
We thought of a reunion after 15 years had passed, and we're working on something fully aware that years have come and gone for everyone (the public). I think the story, how it presents itself as an anime, is turning into something geared more towards adults. I want the people who enjoyed the old days of Digimon Adventure, and, of course, the people who today enjoy Digimon Adventure, to watch and enjoy Digimon Adventure (Tri?) in the same way. At the same time, I want the people who did not watch the original back then to enjoy this new release, get to know the original season for the first time and enjoy all it has to offer.
We would like to know something more about the main image we have from this new season...
We wanted something that said "a reunion of the kids and their partner Digimon" and "the meeting again of the characters from that season and the fans". I wanted the sentence on the official website, "We will meet again", to have this same meaning behind it.
As for the image. There's a shot in the opening of Digimon Adventure where you see the kids being sucked into the Digital World, and they seem to be falling into a very deep place. From this we thought, "What would we see if the kids looked a little older and if we drew them in this same scene?"
Now please let us talk about the staff that's been announced for this season.
For this new season the priority was character design. We find ourselves in a new era, and the design should be welcomed by a wide range of age groups, and, of course, you should keep what worked from the old times. The one who made this difficult balance possible was the current character designer Uki Atsuya. I think it's a design that gives us abundant expression when made to move through animation but always sticks to simple contours. Additionally, Motonaga Keitarou was the person chosen to direct.
I have given this new season to people who have a lot of quality work behind them already so that we could have a strong production, design good battle scenes, among other things, no matter who got involved.
Series Composition is the charge of Kakihara Yuko, who teams up with Motonaga, the director.
In this season's staff we also have people who will watch the new season when it airs, because in this wonderful group you have staff members who are excellent watchers/observers (laughs).
Be up front! Tell us something we should pay attention to in this new anime.
I hope you pay attention to things like "Will these 8 kids join forces again?" or "How are they now, having grown up?" A clue to this whole season can be found in the final story at the end of Digimon Adventure 02. I can tell you that a few words in the last monologue are now turning into the main theme (of the new season). What will they do as they confront different problems so that a union between Humanity and the Digimon can be achieved quickly? In other words, we want to show the union between people and the Digimon.
Please wait for the Spring!
https://twitter.com/Digi_advntr15th/status/543742311834726401/photo/1
Digimon Adventure tri.
- Character designs by Atsuya Uki
- Series comp. Yuko Kakihara
- Director: Keitaro Motonaga
copy&paste from AnimeGAF OT
http://digimon-adventure.net/
Que the persona similarities.