I really don't like the idea, why change what had already been set out. I don't want a new squad nor do I want to see Wrex and the rest take the back stage. I hope at the very least they remain as crucial side characters like what Joker was in the first one... and that they don't get pushed off screen... and that the Shepard/Ashley romance goes on unchanged.... and that Wrex stays where he is. Because I grew attached to the cast I got given, I don't want a NEW one just like that.
I saved Wrex because I wanted to keep Wrex, I made Ash my love interest for the same reason. I don't want anything CHANGED. I liked them, my whole team actually. They'd better still have major roles, be it friend, ally or lover (I liked Ashley because she had personality, bad parts and good parts mixed together, I don't want some new one) whatever because otherwise everything I did, I did for nothing.
At least they aren't going off screen completley... if that happens Bioware would have to be ready to RUN
Good news about the bloodbath ending though, if Wrex, Ashley, Tali, Liara and Garrus CAN'T be recruited then they can't be part of final bloodbath so all the new characters can all die and when the dust settles I'm left with the people I had in the first place.