First, I've just pushed some long-awaited packages of kde-4.0.0 for Slackware. They are only for Slackware -current (this is the development version of Slackware, not the latest stable release), and no, that doesn't mean that the next release of Slackware will have kde-4.0.0 in it.
See the latest post on my ChangeLog:
(Tue Jan 15 17:06:38 UTC 2008).
Second, I'll be attending the release event at Google this weekend, along with Pat, Alan, and Amrit. Fred (slamd64) is also going to be there, so we plan to have a grand time! :-)