Update (2017-10-06): Arc System Works have uploaded their own 7-minute gameplay video showing direct footage from the game.
This year’s New York Comic Con convention is ongoing, and the BlazBlue Cross Tag Battle cross-over fighting game featuring Persona 4 Arena is being demoed.
Off-screen footage featuring gameplay of the two currently announced Persona series characters, Yu Narukami and Yosuke Hanamura, has been uploaded.
More footage featuring Yu:
The background stage is the Midnight Channel, from Persona 4 Arena.
Arc System Works Gameplay Footage
BlazBlue Cross Tag Battle has not been given a release date other than 2018, and no platform has been announced for it as of yet.