IF any regulars made it out on the bus we might have seen that. but that ended being just a big tease
I believe he meant what happened to the bus after it left the prison and before Maggie found it.
SPOILER ALERT
Terminus. Mary (Denise Crosby) can't be the only one there, right? How would you describe the rest of the community?
No, she's not the only one who's there. She's the one that we see first, but we'll quite quickly meet others. In this particular situation, it's easy for them to get in. It's not like they had to go through checkpoints or anything. As they're walking into Terminus, the gate is open and there's a note that says to close it behind you. We see flowers, and we hear a bit of noise from some people milling about. Mary just happens to be the first one; she's the welcoming committee.