Same day support with Catalyst drivers was for new GPUs, not for new OS versions.
For new kernel / X / distro versions we said that we expected gradual reduction of the time from new kernel/server/distro availability to Catalyst support, although our first priority will still be the enterprise distros most of our customers use.
Support for 9.04 is currently at "early look" stage per the release notes, ie it runs but has not been through a full engineering/QA pass. I don't think we have been able to repro the X2 problems on our systems yet, so accumulating good information in a Bugzilla ticket (one, not many) will help the developers. I took a look through the Bugzilla system and didn't see *any* applicable tickets, so creating one would be a good start.
This appears to be a regression related to Jaunty but even that info is not 100% consistent, so accurate info about "works with this combionation, doesn't work with that combination" will help.