I'm wondering whether they're providing an all-encompassing system for leveling any kind of monster, or just some specific 'classes' dealing with certain species and some caveat basically saying 'whatever seems reasonable' for other species.
Of course, I just completed planning the racial abilities section of my homebrew system... I'll be interested to compare the two, because I think what I've got is really good. It's totally transparent with other abilities gained with experience.
But I also find merit in Dragongirl's wish that there'll be stuff on nonhuman mindsets in there, because I think that exploration of new experiences is what roleplaying is all about, and the mind is the coolest thing to tweak. Ever tried seeing an object from every possible angle at once (including inside)? That's the kind of mind-twisting thing I enjoy. If they can encapsulate that experience into guidelines, I'll be impressed.
(And no, I've never used drugs... it's a topological exercise. It doesn't matter that I've never studied topology.)