Well that is the topic.
Action combat MMORPG with no class / playstyle restrictions.
Edit: Small correction.
Unplayable.
But seriously, probably as an live-action, themepark massively online role playing game. I know a lot of people don't think it's an MMO in it's "true from" but for me it's undeniable when you have battles with one hundred versus one hundred.
TES lore killer? WoW Clone? Typical AAA MMO?
Take your pick lol.
Like I said earlier, classes don't define your gameplay. To me personally that is a big thing.
Also one of the major points is the PvP system. It's being made by the same people that made DaoC PvP, which is held as "the PvP system" of all MMO's so far.
Edit: And don't listen to NO_Walking. He's still hurt that the game isn't P2P like he was so sure it was going to be. This is definitely not a WoW clone. There is almost nothing in common with WoW and TESO.
Standard action MMO fair with pretty pointless classes.
My list of pros:
Active combat (aiming, blocking etc)
3 faction RvR
No item equip restrictions based on class
A large majority of skills are derived from sources other than class choice
skills are limited by resources, not cooldowns
Only 5 hotbar slots, but literally hundreds of useful skills, so informed skill selection (especially in large groups) is a major component
Rich and diverse world of TES (obv)
All I can think of for now.