I got this update from PC Pro this morning, Firefox 3.0 will be out in June
I am trying it right now, and boy is it fast
This has not been announced yet by Mozilla, even though that PC Pro press says they are going to. It is not the final edition and many Extensions do not work with 3.0 yet. If you would like to test it without losing your current setup (as normally it would over right your current one) download this HERE and run it on its own