writes "Mozilla Firefox 2.0 alpha is released. The links for download were not available directly on Mozilla.com website. Being Alpha, all features might not work and most of the plugins might not be compatible."
Reading thru the comments, it appears there's some disparity as to whether or not this is actually just a naming scheme that they use; but let me reiterate that there has been no official announcement from Mozilla, so take with a giant grain of salt. Some good screenshots