Phantom Breaker Battlegrounds is getting a PS4 port / enhancement, so maybe they'll announce it's XB1 release as well? Would be there Day One.
One thing I've enjoyed about 5pb lately is that they really seem to be trying to head towards global releases and distribution. The annoyance of Phantom Breaker the fighter getting mixed up with 7Sixty really seemed to light a fire under them, towards self-publishing and attempting international notoriety.
I'd love to see their games internationally on XB1. It's nice the system is region free too. I'd also be interested in things like a Bullet Soul Digital release or something too. I hope to see some nice Japanese Support for the XB1. The smaller Japanese titles on 360 are some of my favorite games of the system... even the XBLIGs. Yuzo Koshiro, I still want a Mamotte Knight II!
5pb. is also open to region free Xbox 360 games. The Phantom Breaker: Extra and Bullet Soul are both region free.