Hi brett...welcome to Magnum Mania.
Your questions have been the topic of discussion for quite some time. Problem is, no definitive answer seems to be available.
We've all agreed at some point or another, that we'd love to see a movie and/or a remake of MPI, but it just doesn't seem to be in the cards. If you look around the forum, you'll undoubtedly run across several different conversations centered around both of those subjects. As time passes, the possibility of a movie, at least one with any/all of the original cast, becomes less and less feasable. Nobody seems to like the idea of recasting the parts with new actors, and I agree, it just wouldn't be the same, but none of us are getting any younger, including the original cast members.
A remake also still remains a possibility, but it would have to be spearheaded by somebody in the industry with ties to, or at least knowledge of, the original, it has been suggested by more than a few people, including myself. Some have even gone as far as putting together their own pilot script, some of which were pretty good, at least in my opinion.
Bottom line is, nobody that I know of has any idea if/when anything beyond what already exists will ever come to fruition...but we can always hope.
I'm sure some of the other long time members here will be along sooner or later to welcome you and share their veiws on your questions.
As for Jesse Stone, I believe there was supposed to be a new one made every year, but I don't think that's happened for the last couple years. Don't know what's happening with it. I've read that TS is more than willing to do more, just hasn't happened recently.
In the meantime, stick around, spend some time looking at older threads and enjoy the best MPI forum in the world!
Edited cause I can't spel....or tipe gud.