It's unclear. I haven't downloaded the new versions yet (too busy to mess with it at the moment), but in picking through the infamous 26-page thread on the Apple Support boards, it seems that some of the supposedly deleted features are actually still there, just implemented differently. Also some of them make me want to laugh, e.g., the one about documents created in the new version of Pages being not openable in the previous version. Well, that was also true about '09 to '06, and I don't remember any complaints about it then.