Nope, still two-layer only. I'm actually pretty disappointed with their PCB UI. It makes a lot of assumptions about the existence of layers, and their ambiguous selection is really bad. For example, I often cannot select a small part for moving if there are too many airwires nearby, because fritzing always seems to prioritize airwires. I end up having to disable the ratsnest layer just to move a part. There's also a move vs create wire ambiguity that's really annoying.

I guess I've just found that this is somehow less annoying than the problems with other PCB softwares.