I would like to see dancer as a tank. Sort of a Wushu monk type that builds enmity by deflecting blows. For some reason, I just can't picture a kata wielding character class being a healer.

Some other kind of healer, perhaps a shaman type that uses magic to absorb damage (like the EQ2 shaman) or a HoT type healer (EQ2 druid).

I don't really think we need another DPS, but a beast master type would compliment the current lineup, one that uses natural abilities, not like SMN that uses magic.