I'm kind of happy that there will be no new love interests. With the inclusion of the two from the first game and the three from the third, anybody else and that'll just get messy. It'll be interesting to see how the "cheating" (if that did happen) plays out. After all, we did kind of see a bit of that in Lair of the Shadow broker if you romanced Liara in the first game. Honestly, the amount of permutations, just with romances alone is almost overwhelming, in a good way. Can't wait for this game.
P.S. Tali all the way
(Update): Damn, even MORE love interests? As I said above, this is going to get messy. I just hope that there will be SOMEONE in the squad that isn't a possible love interest. Luckily Krogan and Geth (if Legion does return) are usually safe bets. Speaking of Krogan, I'd really like to see Wrex make a comeback on the squad. But I digress. I hope that the inclusion of gay and lesbian relationships doesn't hurt the game's sales among the more conservative audiences, and I hope that the gay and lesbian characters are actually fleshed out and not just token archetypes. We see what happens when Bioware puts in a character just for the romance option (Thane, and the result wasn't all that great. Then again that's just my opinion and I have enough faith in Bioware to create a quality game. As I've said in other posts, I just hoped they learned a bit from DA2