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First of all, from what I've seen and from what I've been reading; the game looks/sounds like a blast. I have a question though, is it fairly easy to switch between being a tank/dps/healer? From what I understand, as long as you carry the main weapon (and it probably wouldn't hurt to have the proper gear) then you can switch between ALL the character roles? One thing I don't want to really run into is this:
LF1M TANK GTG
LF1M HEALER GTG
Personally, I do enjoy playing all roles and not just being limited to one specific role on any character. I think Guild Wars 2 did a decent job of eliminating this issue although it does feel a little awkward playing a dungeon in that game due to the fact that there isn't a trinity.