fps is a big one. first person shooter. if you swing your sword whatever is in its path gets hit.
a concept of an mmo thats skill based. not depended on how long you grind or what gear you have.
a sandbox world. no instances or zones. no parallel lvling zones that you never return to as you lvl.
cities you build as a clan, complete with npcs. basically everything you get with a traditional mmo city, but it is player run, and cant be taken just as quickly.
i have yet to see an mmo that combines mainland gaming with a naval aspect.
player ran economy/rules.
ever changing skills in game time environment. penalties vs rewards for combining skills. also deteriorating skills ingame time for lack of use. basically say u make a fighter that wears plate armor and carrys a huge claymore. but you want to be a mage now. as you build up ur magic and cloth armor your warrior skills start to drop. as is with crafting, you decide you wanna be the best crafter in the game and make crazy money. well the more time you spend crafting the more you fighting skills drop.
there are over 500 skills and spells
basically what sets it aside is the fps style true mmo. no more target nearest enemy hit attack 1 or attack 2 you must aim, and if anyones around you they will get hit also.
i'd have to recheck the forums lol but if you need more im sure i can get them to u.