Lego Brickheadz Ghostbusters Image Revealed

Today seems to be the day for Brickheadz.  After Darth Vader and several Harry Potter characters were revealed in Brickheadz form this morning, Lego officially revealed an image of an upcoming Brickheadz two-pack including Peter Venkman and Slimer.  Both figures look excellent and leave me wondering what other themes Lego will explore with the Brickheadz line.

Who ya gonna call?