From my interviews, three programs had categorical spots.
UPenn became exclusively categorical this year. Their curriculum was not set at the time we submitted our rank list but it sounded like most prelim medicine years with a couple rehab electives.
Baylor had a prelim/transitional spot that you could apply for - your PM&R interview counted as interview for intern year. I also remember that year to be like a medicine intern year. seemed tougher than some of the transitional/prelim programs I applied to.
RIC has a categorical spot at Northwestern hospital. Their year has 3 months of rehab built into it. (no call, no weekends) In addition, during the PGY2 year, while the other residents do 11+months of inpatient rehab, the categoricals get a 3 month break to do int. med (I think very light schedule - no call???) So overall, it's a very attractive position. Most of the residents who did the categorical program loved it. It's also a good way of getting a head start on learning the system, living in Chicago, etc.
hope this helps.