Firefox Mobile Alpha coming in "a few weeks"
It's not clear exactly what devices or operating systems will be supported by the early Alpha. Pre-alpha releases of the browser, code-named Fennec, are already available. But at the moment, they only run on the Nokia N810 internet tablet. The N810 is a pretty cool little device, but it's not as ubiquitous as say, Windows Mobile or Symbian powered cellphones.
Mozilla does plan to make a Windows Mobile version of Firefox Mobile available. I just don't know whether we'll see that version in a few weeks when Fennec hits alpha.