This is how I think it'll go: I don't think there will be any announcement or anything like that. A media source (most likely TMZ) will catch him out and about with his kids, or his mom, or his entourage. And post it. The news will make it's rounds that Mike is alive. There will be doubts, arguments, etc. etc. And then he'll keep us wondering. The nonbelievers will keep guessing, we'll be satisfied. And weeks, maybe months later he'll resurface to "apologize" the the sensitive ones.
That's just how I visualize it all.