I love how beautiful it looks, the scenery is making me explore despite the lack of a cartography title! Way to go art guys, it's just beautiful.
The dungeons are just ftw, I think they're the perfect balance of difficult and reward. I loved how we need to think a little bit differently to get through, the only thing I can suggest is that level map makes it too easy! The atmosphere in the dungeons is incredible... I just love the Sorrows Furnace feel in some of them.
They've obviously put so much effort into this game, the rabbits were just awesome! I was chasing those silly things down to get a screeny of them, and well... we know what happens.

(And if you don't, I suggest you go find some rabbits and chase them!)
This preview has made me very excited for when the full game goes live! Brilliant Job ANET, cookies and martinis for all! <3