For many of our later 3.5 products, we did try to work forward and make sure that the design elements worked well with the then-unreleased rules for the PRPG. So yeah, things should work pretty well still, even though the "elf cheat sheet" on the inside front cover's out of date.
We've sort of assumed here at Paizo that if/when an older product goes out of print, and if/when it makes sense to reprint that book, we'll update what's needed so that it'll work nicer with the PRPG rules while still making sense to 3.5 gamers. As of right now, though, nothing's actually hit that magic reprint stage... although some books are getting close.