I liked the trailer, pretty cool monsters and armor, plus the graphics were nice, but seemed low enough for me to play on my laptop.
Describing the PvE as "endless" seems like a hard to live up to promise though. Unless there are randomly generated bosses and events.
I haven't seen many MMOs with good monster transformation systems, but if it's really well done it'll probably be one of the best parts of the game.
Hard to really say anything about the PvP from the trailer, but with the promise of besieging castles I remain optimistic.