There saying that this beta is likely the last, but who knows? Everything is
in flux in browsers right now. HTML5, html versioning eliminated, IPv.6,
flash built-in with some browsers and others not, and java with Sun takeover
and the lawsuits. Not a great time to be a web developer. There are reported
problems and delays in Mozilla, but as I said you can have your cake and eat
it too. You can install Minefield and still have FF3.x in case it does not
work out. Mozilla has a history of slow releases and double figure betas are
just another facet of that.

At least things are transparent and you can see for yourself by trying it
instead of believing the hype.