I was curious on how the combat system/game-play works?

Will it be like the most MMO's out there (Select enemy) press skill/ability buttons.
Or will it be more like Skyrim?

Is there like any game-play video with a hub or something?

You should probably get all of your answers from this topic, http://www.gamesas.com/topic/1440345-clarification-in-combat-mechanics/page__st__90

I looked into it but the only thing that is discussed are roles and agro as far as i know..

Combat is like Skyrim/Oblivion with extra 6/8 hotbars for skills.

Ok thanks yeah i have just seen the HUB however i didn't see a skill bar but i think your right.