I recently found out one of my undergraduate supervisors/mentors has been accepted as a visiting fellow at MIT. If all goes to plan, he'll be at MIT starting next fall.
I'm a senior year student of physics, and I have already planned to take at least a year off before applying to graduate schools in theoretical/mathematical physics. If the professor isn't around, I'm pretty much left stranded. In a small department, he's the only one who does research in theoretical/fundamental/high energy physics.
After congratulating him on getting this position, how should I go about inquiring about my status from him? Also, we used to have another professor, say X, in the department (kicked out, unfortunately) with interests in mathematical physics. The professor in question, Y, is in good terms with professor X. How can I potentially ask professor Y to recommend me as a student to professor X, assuming professor Y won't be available starting next fall?