SLR Magic's newest release is a wide-angle lens for Micro Four Thirds cameras, which is billed as the fastest ever at that focal length. The $499 lens has a 12mm focal length (24mm equivalent) with a maximum aperture of f/1.6, and it's manual focus only. While that's certainly fast, and you might not see any 12mm lenses faster, there are other 24mm equivalents which have a wider maximum aperture, and both Nikon and Canon produce 24mm f/1.4 lenses. The early reviews sourced by 43 Rumors are generally positive, though the lens has a significant tendency to lens flare.
The one big issue is where you go to buy one of these. SLR Magic doesn't have a real web presence, only an eBay storefront, and the press release only offers that it'll be available "from authorized SLR Magic dealers end [sic] November 2011." So keep your eyes peeled at major online dealers, and maybe even go and talk to your local camera store and see if they can get one in for you.