I know some people here are curious to try Firefox OS. Today, I was checking the Geeksphone shop and saw that Keons are back in stock and decided to share this here.
Remember that the Keon is a low-end device. Its not comparable to an iPhone or an S3. Firefox OS devices of that class are aimed at current feature phone users to make them benefit from switching from Symbian and Bada phones (or crap android phones) to a phone where they have access to the whole web ecosystem.
From a developer point of view, developing for the Firefox OS is extremely fun and refreshing. I recommend that to any developer, its just great. If you're already developing HTML5 based stuff, there is no harm or risk porting it to Firefox OS anyway.
http://shop.geeksphone.com/
And for those wanting more development information check out:
https://developer.mozilla.org/en-US/docs/Mozilla/Firefox_OS https://marketplace.firefox.com/developers/
Cheers andre