Looks like Firefox Mobile "Fennec", which was supposed to be released this year, will be delayed too, like the other versions of Firefox. Firefox Mobile, was supposed to be released for the Nokia N900 Internet tablet in late December 2009, however, we have already reached the final day of the year and there is no sign of it.
It would be impractical and totally unwise to release the software on the 31st December of any year, so we can safely assume that you will not get a chance to use it until 2010.
Delays in releases are always there, but it is often suicidal when you are entering the industry. Especially more when you are trying to compete with the likes of Opera Mini and Skyfire.
Firefox Mobile is however available for downloads as a beta on this page.