The Micro-Four-Thirds (MFT) system is clearly the most mature micro-camera system on the market. Consumers can choose between a large variety of cameras as well as lenses. However, to date MFT covered primarily the budget to mid-class market segment only - possibly because the high-end approach of Four-Thirds (classic) failed so both Panasonic as well as Olympus were probably a little shy of entering again. The Voigtlander Nokton 25mm f/0.95 created some buzz though so there is a market here after all. Olympus has now finally released its first professional grade MFT product - the Olympus M.Zuiko 12mm f/2 ED. They've thrown in a couple of new technologies both in terms of optics and mechanical implementation. The pricing is quite brave with an MSRP of 800EUR/US$ although the usual street price is generally lower, of course.
The field-of-view is equivalent to 24mm in full format terms so it's a moderate ultra-wide angle lens. The max. aperture of f/2 is certainly fast with respect to light gathering but don't expect wonders in terms of depth-of-field - in the MFT scope you are are effectively "loosing" about two f-stops so it "behaves" like a "24mm f/4" here. This is still sufficient for quite shallow depth-of-field images if you move close enough though...