User blog comment:FridgeRaider88/Mass Effect 3 Squad Speculation (spoilers)/@comment-3119615-20110227053210

Ok heres my take on it.

Ashley/Kaidan: I believe they are shoe-ins to be in ME3, but as squadmates i kinda doubt it. They are angry with Shepard especially if they are romanced and then cheated on, in fact I believe there will be a point in ME3 where u need to try to sae them from the Reapers and they get killed off. So I don't think they'll come back as squadmates.

Garrus Vakarian: YEAH! As long as he's alive Garrus has to come back he wouldn't abandon Shepard now, he'll fight beside him to the end! Yeah, he should probably have a second-in-command role to Shepard in a way so his leadership skills can flourish but he'll be back definitely.

Urdnot Wrex: As a squadmate, as much as it pains me to say it, more than likely not. As he said he needs to keep those "Short-sighted fools" in line. He'll probably be Shepards contact with the Krogan forces but will not return as a squadmate.

Liara: No, she will funnel information to Shepard as the new Shadow Broker but will not be a squadmate.

Tali: Yes, especially if romanced. She will stay by Shepards side during the fight will the Reapers, but she may join late into the game since she may need to help and get her people ready for the Reaper Threat, but she will more than likely return.

Miranda: Yes, either she quit Cerberus to help Shepard or they are both still employed by Cerberus either way she's still on his side and will be there against the Reapers, especially if romanced

Jacob Taylor: Definitely, he is loyal to Shepard and he likes how Shepard does things, he will be by his side

Zaeed Massani: Aside from the whole "DLC Character" thing. I don't think Zaeed will stay especially if Vido is still alive, if Vido is dead then Zaeed will probably pull a Wrex and be SHepard's contact with the mercs and Terminus Systems

Kasumi Goto: No, if Keiji's Gray box is destroyed then I'm not sure what she'll do but if she still has it, then she'll drop off the grid like she said

Dr. Mordin: As a squadmate, no. He is really old by Salarian standards. He'll probably be an NPC

Jack (Subject Zero): I think it depends on how Jack feels about SHepard if she is romanced (the right way) and she is loyal then most definitely otherwise she may not even be encountered.

Grunt: Yes, Shepard is his Battlemaster and there are monstrous adersaries on the horizon he will not abandon Shepard and he will love the challenge of combating the Reapers

Samara: No, maybe as an NPC but not as a squadmate. Her service to Shepard ended when the Collector Base was dominated so she will not be a squadmate

Morinth: No, she will turn tail and run after the fight with the Collectors

Thane Krios: Maybe, either he is dead. Or he will be a squadmate partially and then be killed in combat.

Legion: Yes, he and Shepard will rally the Geth and they will attempt to convince the other species to work alongside the Geth against the Reapers. Legion will stay beside Shepard the entire time.

THis is of course assuming they are all alive. In fact if you go into ME3 with a set number of squadmates from ME2 alive I think in the opening scene there will be a battle of sorts and some of them will die, like with Pressly in ME2. Either them being killed off will be random, chosen by BioWare, or decided by how you interacted with them, what do you think about that?