User blog comment:The Shadow User/Squadmates in Mass Effect 3/@comment-2174252-20101013162507

This topic has been debated ad nauseam in this blog before. There are two squad mates from both games that we know for sure didn’t die: Liara and Ashley/Kaidan. All the other ones (and, yes…including Wrex) may have died. So, there will be additional characters to recruit in ME3. How many more? I don’t think it will be more than four.

Assuming Sheppard and the whole team died in ME2, or you don’t import a saved game, the player will have to start a new Sheppard with the option of recruiting up to 6 squad mates including Liara and Ashley/Kaidan.

Otherwise, it might be like Kiadony’s idea: a combination of existing and/or new squad mates not to exceed a certain number. I think it would be 12 – 14. More people would make development exceedingly complicated and long due to the amount of alternate conversations and subplot lines.

Of course all of this is IMHO.