Got some more info. on this from NAB website. It's called a repack and many channels across the country are affected. Locally, all the previously mentioned stations as well as channel 29 and some low powered stations will change also. It's about cell phone companies buying spectrum.
There's at least one such station, actually: an LPTV in New York City.With UHF and VHF now irrelevant in regards to virtual channels, who's to say a station can't use 37 as virtual?