Just a few minor bugs I've come across recently:
In beta, when playing 1v1 and ending the first round with Val's level 3, it usually does not let you pick your vial load type. I was able to get it to load a non-purple vial once, but not sure what I did differently.
A menu bug in beta. If you leave a lobby, it takes you to the first versus menu, as opposed to dropping you back in the lobby browsing menu (like it does in retail).
In both retail and beta, you can start a local tournament mode game with only 1 player assigned a controller, leaving no way (that I can find, at least) out of the controller configure menu.
Know that all 3 of these bugs are pretty obscure and none are game-breaking or anything, but hope that reporting them helps!