Here's my feedback from participating in the beta for XB1. Firstly, it took quite sometime for me to be able to play as I had to change quite a few settings in my router. As well as following the steps recommended in the connectivity trouble shooting I also had to disable Native IPv6 and allow Toredo ( allowing Tordeo was specifically to get Open Nat). Connectivity is also a bit of theme with the P2P model as every time someone leaves there's a pause in play. This happened while I died once and then the game seemed to rewind when the session was restored which seemed a bit weird. I'd strongly recommend dedicated servers with IPv6 as IMO that would solve a lot of these issues.
There seems to be a lof screens where you're waiting for the game to begin in 4v4 Dominion. This seems to be at it's worst when both team's have selected their teams and the 8 players are waiting for what seems like an eternity before leaping into action to signal the game is ready to begin. Game play is good and extremely fun. To be fair, after resolving my connectivity issues I didn't have more than a day and a bit left so didn't get to test gameplay for as long as I was hoping.
The characters seem good but I agree with comments that there should be more customisation. It would also be good if people could vote for each other after the game like Overwatch. Coins should increase based on your performance as well, 30 per game regardless of win or lose seems a bit mean. Ultimately, I enjoyed the game and had a great time.There's probably some nerfs and buffs that can be made to certain characters (maybe Nobushi was a bit OP...). Those could be made after the game is released in my mind and probably will continue to be as time goes on. Looking forward to the game's release.