Given what you guys have said, it does seem likely that they're experimenting with a TV series for Equestria Girls, but I highly doubt they are also going to move away from the Main Six in the main show, especially by focusing more on Starlight and her friends. The focus on Starlight making friends feels more like a method to build a Simpsons style supporting cast, not to replace the existing one.
UberTag, concerning the idea that the songs in the Equestria Girls specials contribute to the lack of songs in season 7 (yes, I read a spoiler block, since I'm not worried about being spoiled about EQG), I doubt this special contributed to that, at least for the song itself. It was already made years ago, since it was on the Friendship Games soundtrack. They obviously did have to make new animation for the song, though, so I'm not sure how that influenced things. In any case, the low number of songs in season 7 is almost surely because there are a large number of songs in the movie.
Also, added a warning to my song link that it spoils the end of the special.
Anyway, episode followup.
Looking at the fan content for "Forever Filly", there is once again less than you'd expect given the fact that it's been available for a week, and unlike "Fluttershy Leans In", there is a lot to draw. It's hard to say for sure that there is less art overall than there would be if there weren't episodes airing early, but it seems like it to me.
PREVIOUS EPISODES
Still one more "Rock Solid Friendship" comic.
Another Friend
Gina Giraffe
Long tongue
Duck Duck Rabbit
Pinkie Giraffe
Pointy Ponies - Fluttershy Leans In
"Fluttershy Leans In" comics
Vet Got Your Tongue
Welcome Home
Discord Tries to Help
NOTES
There are a few size comparisons that have popped up. It's hard to say for sure if the Sweetie Belle size comparisons actually mean anything, but the dog has definitely gotten bigger.
Sweetie comparison 1
Sweetie comparison 2
Puppo
Also, Sweetie Belle mentioned being interested in experimental black box theater.
That's actually a thing. It refers to plays performed with little to no props on a black stage. This has the benefit of being very cheap and having few requirements for the venue, making it popular for college productions. The Wikipedia article doesn't mention experimental theater, but it seems like the perfect conduit for it, especially with the article's mention of how the black set allows for a sense of "anyplace", allowing flexibility in the setting.
SCREENCAPS
Cameo from Fancypants, Fleur-de-lis, Lemon Hearts, Minuette, and Moonlight Raven
Messy Canterlot Boutique
Rarity's dress design
The nostalgic picture - Note that you can just barely see Sweetie's cutie mark. While it isn't too strange that Rarity would be nostalgic of a picture this recent, it does diminish the meaning a bit. However, I get the feeling that we weren't actually meant to see the cutie mark, given how much the rope covers it up and that we don't see it in any of the other old pictures. Perhaps it was a rendering error, and the intention was that Sweetie didn't have her cutie mark in the picture.
Sledding
Other old pictures
Mountain that magically appeared in Ponyville
Someone add a Jojo's Bizzare Adventure "To be continued" to this - I also like ED's comment that this was almost Chipcutter's tombstone.
CMC statue
Wall of clients
Puppet show crowd - It's the same guy from "Inspiration Manifestation", using the same stand that Rarity made for him. Given that Twilight had to manually change back everything the IM spell made, perhaps she just missed this. Also, if Rarity and Sweetie used to go to his shows all the time, that explains why Rarity got so upset when he didn't like her first stand she made for him.
Ice cream parlor - Note the delicious looking chandelier.
And screw it, just embedding all of these.
Shepard and lamb
Chicken and egg
Butterfly and caterpillar - Yes, those are the same wings from "Sonic Rainboom".
Frog and tadpole
Flower and sprout
YouTube captions.
I can see Sassy saying this
Phrasing, Sweetie Belle
Rarity, not in front of Sweetie
Episode summary
GIFS
Getting an afro
Reversed GIF - Sweetie slamming the door on Zippoorwhill
Petting Sweetie Belle
Sitting on stools
Petting Scootaloo (embedded)
Endless posing
Top 10 Saddest Anime Rejections (embedded)
Flower Rarity up to no good
Rarity licking the sundae - I'll avoid jokes about this.
FAN CONTENT
Cater Belle
Sweetie Belle Sheep - Made a week ago.
Sweetie and Arizona (Them's Fightin' Herds)
Sisters
Dog Show - Made a week ago.
Butterfly Rarity
Dia de Hermanas foto - Made a week ago.
Budding Flower
Comics/image with a lot of text
FlowerStalk
Crisis
Cats in the Cradle - Made a week ago.
I expect much more to come as the week goes on. Some big artists that make an image for every episode, like Assasinmonkey and Luminaura, haven't made any yet, for instance.