Lower Dens were a favorite discovery of mine in 2010 and they are already starting off 2011 with new tunes. Lovely. The 7" is out January 18 on Gnomonsong. "Batman" is the A and "Dear Betty Baby" is the B. Pre-order it here.
Also, the fine folks of Lower Dens have created some sort of cooking infomercial for the single. It's delightfully bizarre.