This morning, the MASTER transient group published ATel #4560 announcing optical detection of a source coincident with the OH maser OH 63.3 -10.2. This is a bright infrared source, but is (mostly) invisible in the optical. Most (all?) of the OH/IR stars are pulsating like Mira stars, but have so much extinction from circumstellar dust they're invisible. This one has put in a brief appearance for MASTER, getting caught at an unfiltered magnitude of 17.3 on 2012 November 6.5524 (2456238.0524). According to Podvorotny et al., the object was detected on a Palomar red plate on 1992 August 31, but not on 1990 September 15.
Coordinates for the MASTER OT are 20 28 57.00, +21 15 33.2. Coordinates for the 2MASS source known to be associated with the maser are 20 28 57.10, +21 15 37.0. They are almost certainly the same source.
This will be a target for large-aperture telescopes, and will be very (very, very) red. I've submitted it to VSX now, and I'll post a name once it's been approved and assigned an AUID.