by mic_al
It's been roughly equal, more in favor of 4 player maps, so far imo.You have BoL Volumes I and II, C&F, Buffy, 5 Marvel sets (including the upcoming Brains & Brawn), and Tales to Amaze; which totals to 10 sets with 4 player maps (and 14 total 4 player maps as 4 of those are double sided).
On the other hand, you've got RH v BF, 2 Jurassic Park sets, LR v Beowulf, Houdini vs the Genie, and Rising Sun which totals to 6 sets (7 maps as RH v BF is double sided) plus two single fighters (Bruce Lee and Deadpool) without maps.
I'm not sure why you assume that "most sets" will be 2 player only.