Are there any gameplay differences between the PS4 and Vita versions?
Not really. There are more NPCs walking around in the PS4 version, so more people may get involved in random street brawls, but I haven't really noticed that happening as much as I would've expected.
And there is Toybox Mode, which lets you start the game with one of every weapon and clothing item (at the cost of not earning trophies or being able to save clear data on completion), which certainly would impact gameplay. But I'm not sure that counts.
I am sorely disappointed there is not a Kati route in this game. She's so cute. :<
You and everyone else, I think. Kati is pretty much everybody's favorite character. I really have to wonder if there originally were going to be a Kati route, but the devs just cut that at the last minute because they knew nobody would go after any of the other characters if so.
Where can I see how much stuff I have in my inventory, and is the crash issue going to get patched?
You... kinda can't. There's no meter that says your inventory is such-and-such percent full, anyway, if that's what you're asking. But I wouldn't worry too much about the crash -- you'd have to play through the game like, 2 or 3 times in a row without selling or fusing ANYTHING before it even has a chance of becoming an issue. Your inventory space in this game is massive. Best way around the issue is just to sell off all your unwanted items after beginning a third playthrough. Do that, and you'll be absolutely fine.
As for patching the game... it doesn't look like it's going to happen, unfortunately.
Is the PS4 release date on Wikipedia real? I'm not seeing it everywhere else.
We haven't announced a release date just yet, but we probably will soon, so stay tuned.
One thing I've noticed about this and many other XSEED games is that someone on the translation staff really likes their Simpsons references. :lol
I think most Americans fall into that camp. At least, most Americans over age 30 or so. We grew up speaking Simpsons quotes. I think that's one of the U.S.'s official languages, in fact.
-Tom