Since it was released in final form a couple of months ago, it would be nice to have the new DTDs available. There's probably no reason this couldn't be pushed as an update to all current branches of Fedora (7, 8, and soon 9). This would help, among other things, when using RelaxNG to validate DocBook XML, because the 5.0 version includes support for XInclude built-in.
Never mind, I misread. V5.0 is only a committee draft thus far. Sorry for the bother.
Thanks for report - yep, RC only (or comittee draft) yet. Docbook 5 is afaik a bit more different from Docbook 4 family, so my plan is to have things around Docbook 5 as a separate package or subpackage. I'm monitoring situation about Docbook 5 and will try to get at least RC Docbook5 packages/subpackages to F10 (hopefully).