We know almost nothing at all about combat in the game, except it will most likely be 3rd person view combat with a hotbar and "tab" targeting system. That still tells us absolutely nothing about how the4 combat will actually play out, for all we know it could still be real time fighting even with these systems in place, and actually most real time combat mmorpgs we have still use lock on targeting to an extent as well as hotbars.
Tera has real time combat, but also features a lock on target system (or tab target system if you want to say it that way) as well as a hotbar for skills and spells.
Mortal Online: A first person only real time combat mmorpg also uses a hotbar system as well as a target system.
Im not saying TESO will have something like this and im not holding my breath expecting it to have it, but for all we know (which is very little) it could have real time combat and still have a hotbar and "tab target" system.
I would like everyone thoughts on how the combat system could play out and how you feel it should be.