I took a look at this list of races and templates from my DF game. Here are the ones we haven't seen . . . yet.
We have yet to see any of these:
We haven't had any of these, either:
Assassin (DF 12)
Evil Cleric (DF3)
Unholy Warrior (DF3)
We haven't seen every Barbarian and Swashbuckler variant, either - we've had only basic barbarians and savage warriors, and vanilla swashbucklers. I don't want to count every single variation, though - there are lots of them, and it's not such a big deal to me if the swashbucklers we've seen or barbarians we've seen have used all of the templates available.
I think I'll likely see a High Elf or Half Elf before too long, but Half-Orcs have a lot of baggage. All of the three "evil" templates - assassins, evil clerics, and unholy warriors - also have a lot of baggage. Especially evil clerics, who can't be adventuring with the regular ones and who, despite all sorts of hoping to the contrary by my players, aren't just good clerics who get extra evil abilities. You give up a lot when you turn evil. Bards, well, someday someone might run a bard. I like the DFRPG one better but either would be interesting to see.