My gut feeling is that shortly FF 4.0 RC1 will be released based on a couple of things:
1. release a new build 4.0Ć13pre(20110306) which was late generally they are always on time
2. work has already started on FF5 which will also have a 64-bit version << good news for win7 -64bit users
3. i'd bet FF 4 RC1 will appear in April
Anyone wanting to see a 3D cube with each face playing video, here is a direct link
http://www.mirana.net/mediaXX.html
this only works in FF 3.6.15, html5 transformation isn't really supported at the moment with Opera, Safari, Google Chrome and Maxthon. I truly wish that they get off on their butts and get working on the CSS3 standard.
I do hope that with the release of WB 2011 that they will open a new section in this forum relating to html5 and CSS3 by virtue that the release will support html5.
Btw, the latest draft html5 specification release is March 5, 2011.