You do realize that there are more distros than just Ubuntu, don't you? (note: I sometimes/often question whether or not you actually do...)
i.e. Dave Airlie works for RH, so you can bet that it will hit Fedora first. If not in F12/testing, then at least in Rawhide -- and this will be WAY before ubunuptu 10.04.
As most Linux users are on Ubuntu, it's more relevant to mention Ubuntu, but Fedora users are fairly common too so I agree it probably could have been mentioned. Ubuntu is beta enough as it is for my taste. I'd only use Fedora in a test environment after the hell I've gone through with it in the past.
Regardless, there will always be distros that will choose to make different kernel versions the default, and you will of course have the option to (easily, via repos) use either version with both Ubuntu and Fedora. Well, I don't know about .32 through the repo with Fedora...but maybe?