I hope he does. He has certainly done enough work on this outstanding app/program to deserve some positive reinforcement!
Marvin 2 had a free version so people could experience "the bliss" of Marvin (and older iPads could run it) and there was also a paid version which did not have the 1 book at a time limit. I would expect Marvin3 to have something similar. I, for one, am more than willing to kick in a chunk of change for the new capabilities inherent in CSS3/ePub3.