The OASIS DocBook TC approved the release of DocBook v4.4 as a Committee Draft this week!
The next step is to go for OASIS Standard, but I imagine that process will take longer than the Committee releasing DocBook v5.0...
You can see the specifics on Norm's blog: http://norman.walsh.name/2005/01/28/docbook44 , read the specification at: http://www.docbook.org/specs/cd-docbook-docbook-4.4.html and get the schemas at: http://www.docbook.org.
Enjoy!
See also: DocBook
