Hopefully we have a scene with the New Protagonists on the News as Heroes shown on a TV at a Bar and Sam telling people that he knows those Robots and everyone else is like "Oh Yeah sure you do"
I liked him in the first movie just fine, but I didn't care for the development of the character, how they kept setting him back to the "normal life" bullshit as an excuse to have scenes like the job interview in DOTM and the college pot brownies in ROTF. If they'd found a better way to integrate him with the NEST guys, I would've had a lot less of a problem with him.
It would make sense that the Allspark left Sam after the Matrix reformed. And HELL. NO. Sam is one of the worst characters ever done in any movie.
Could. Shouldn't. Probably won't. I say "shouldn't" not out of personal dislike, but because his character arc has been finished.