I'll be bummed if I need to have the HUD on to know what's up with submissions. I hate HUDs in fighting games and it makes the experience infinitely better to have none at all.
From WWF No Mercy for N64 to UFC 2010, HUD: OFF. Don't make me change now for your silly submission minigame, plz.
Hopefully good ol' controller vibration will be there to help me out. If not, that will be my biggest complaint.