There are quite a lot of people who say that all you do in ME2 is assing around without a real purpose. I always answer: No, you fly around the galaxy, building the most badass team sentient life has to offer and destroy/repurpose an important enemy base of operations they could have used against us in the coming war.
So one of the main points in ME2 was building your team, and that's good, because I imagine you are going to need people who can kick some butt. So taking away all our squadies in ME3 would make me look back at ME2 with a raised eyebrow and ask myself the following question: What was the bloody point?
I'm not saying ME3 will be terrible without the old team. But it would waste a lot of potential. I still hope that BW held Liara and Kaiden/Ash back in ME2 so they could have their great comeback in ME3. As for Wrex. . . I would really love to have him back, but let's be fair: "I'm trying to unite my species and save them from extinction" is one of the more convincing excuses I have heard in my live.
Still, I'm afraid some of our squad members are not going to be in ME3. I guess that was part of the reason BW gave us so many squadies: Poke us a bit for reactions and see which of them the fans like most, so they can bring them back for the grand finale.
Oh, and I herby
demand a
*we're putting the band back together* dialogue option when you recruit one of your old squadies

Well, that was way too long. I won't ask you to suffer through my unbearable attempt to bring my point across in English, so let me just say: Yes, I want my squad back in ME3 and hope that BW will make it happen.