"Because we don’t know if or when Microsoft will release a native development kit, we are putting our Windows Mobile development on hold," reads the post.
Parmenter does hope that eventually they can start development back up, but says they will move their focuses elsewhere. "While I hope that we do see Microsoft provide us with a way to build Firefox for Windows Phone 7, we will continue to focus on the things that we can control: building a great consumer product on both Android and Maemo."