I'm not sure which factors actually play a role in the release planning, but currently it seems Fedora is again releasing quite late in the spring. The interesting point here is IMHO that Fedora is _so_ cutting edge it already has features in Fedora 10 which others use only in their next spring's release. GEM and even KMS in Fedora 10! KMS will be in the 2.6.29 at earliest officially, but if Fedora does all the hard work again others have more easy time to backport KMS too.
I can imagine Fedora 11 to perhaps have eg. Gallium architecture, while possibly Mesa 7.4 will be released with traditional DRI, but now with GEM support for the "rest of the gang". Of course Fedora 10 already has Mesa snapshot with GEM support (or is it the Intel's 2008q3 branch). Again Gallium would certainly be something that is very, very leading edge where others don't probably have the resources or the talent to actually implement in a supported release before next autumn.
It's no wonder there are delays in Fedora schedules, among other reasons, since such a leading edge features are not as predictable as using mostly stable releases or at least pre-releases with known schedules. I just hope they also consider the stability, since it'd be sad for Fedora to lose users because of being too cutting edge.
(btw, is it here where the zillions of other-distro fanboys referred in the other, longer comments thread were supposed to be)