The game comes out June 28th in NA and EU.
EU I think is getting a physical copy through Amazon, while it looks like US is digital only.
They released an NA demo. It lets you play through the first chapter of story mode. You can also play free battle 1P only with Jotaro, Kakyoin, Josuke 4, and Okuyasu. Only the Moiroh stage. It's not as good as the 2D JP demo was, mainly because that one had online.
For those thinking of getting it, here's a run-down on what the JP version was like:
-No local co-op or versus multiplayer. You had to go online to fight other humans.
- Story mode is about 8-12 hours (from what I've seen) if you watch all the cutscenes and did all the extra missions.
-The skill tree keeps your character's moves locked behind levels, Sonic of the Secret Rings style. Leveling up friendship does nothing.
-No chapter select, so either you're done story mode, or you erase your progress and start over.
-There are some mini-games in story mode, but they're not super fleshed out. Find Harvest bits, Dynasty Warriors beat-em-up missions, D'Arby poker.
-You cannot unlock/play as any villains in Story Mode
-Netcode, according to people was crappy, but we'll have to see what it's like here.
-No micro-transactions or campaign mode. You can buy costumes and the like in the shop with in-game gold or S ranking some super tough missions.
-No arcade mode, no training mode (even though they had an arcade mode in the 2nd JP demo).
-All characters unlocked from the start in modes other than Story.
The US and EU versions will at least come pre-packed with all the patches they released, Part 4 Jotaro, and the costume unlock missions.
As for the other things listed above, we'll have to wait and see if they address any of it.
I highly recommend waiting for reviews/impressions for the US version if you're on the fence. Best not to get your hopes up. Hopefully if it's digital only, it gets a reduced price.