So far I was surprised at the absence of mana regeneration in the game. So far the only way I've found to regen mana is to touch an Aethyrite crystal or to use the Conjurers 15 minute ability that restores mana. At first I thought this was going to be a huge hindrance but spells cost next to nothing and you get a spell that does decent damage for no mana. I'll report back in later after I delve more into the classes.
The game thus far has been stunningly beautiful. I mean there have been times where I've just been floored by the graphics. So far its been running smooth on my system (4gb ram, 3.6ghz quad core, 1ghz gram) with some hiccups here and there but I am running a pretty bad graphics card. As of now there seems to be no grouping in the game, everyone is off soloing but I can understand this as everyone is just messing around until the game comes out.
I'll fill everyone in on more of my reactions once open beta is released!