they could be the same group that got those folks the gov and his boys passed over.
carol may now be with them too.
There is that other group that raided and killed the other unknown group in the Governor’s woods.
A wild plot would be the Governor attacking the prison, and then the unknown group raids them both. Rick and the Governor would have to make a truce to survive. I hope they don’t do this plot.
And don’t forget about the radio guy. I think Carroll will find him in a 30 second scene at the very end of this final episode.