I've been thinking about this topic again, and looking at the empty character shadows on the DA2 site. I think we're going to get tons of new companions, maybe, like ME2.
I'd like Dalish elf companions, because I think their history is interesting and I'd like to find out more about their people and explore romance options. I doubt they'd be a permanent partner, as the Dalish are specifically trying to get away from humans and their short lifespan disease.
Dwarf Male hottie. Smexy beard mandatory. ROMANCEABLE. *shakes fists in fangirl desperation* Why do so few others think dwarves are hot? Goddamnit.
I'd LOVE a Valen (NWN: HotU) type companion. Please reboot Valen into DA2.
I'd like companions to have a relationship (as a romance, family, or just friendship) with each other, like Baldur's gate. For example, say we get a brother and sister pair of Dalish elves and depending on your sex, you could romance either and the other would try to threaten you or whatnot if you break their sibling's heart. The two get bonuses if you have them together in your party, and different dialogue occurs when adventuring, but that one's just a given.
Also, companions in your party will flirt and build a romance with each other. Like Aerie and Haer'Dalis did in BG2.
This seems especially plausible, considering the ten year span the game will take.
omg they could make babies with each other. AWESOME.
the babies could be in DA 3 and become companions for the god baby protagonist. AWESOME.
but i digress!