Unless they use your profile from MA 1 it would be impossible due to the fact that there are too many potential outcomes to the romantic portion of the game.
Rmag37 - Actually, because of the way Asari breed, this is entirely possible. They mate by joining minds so liara could have had a child with shepard, male or female.
Nobody can be sure until the game comes out or cryogenic releases that information.
Considering the possibility Ashley or Kaiden will be dead, and possibly Wrex. They'll either allow you to import your character or have to run with completely new companions.