Sigma were showing their new 19mm f/2.8 and 30mm f/2.8 Prime lenses for the Micro Four Thirds and Sony NEX E mount, Sigma cleverly filling in any gaps in the currently lens lineup for Micro Four Thirds and Sony systems. The new lenses are not pancake lenses in order to maintain high quality, however they are still compact, particularly the 30mm lens which looks good on the Olympus PEN E-P3 shown above.
Sigma 19mm f/2.8 EX DN Photos of Equipment
Sigma 30mm f/2.8 EX DN Photos of Equipment
The Sigma 180mm f/1.8 APO Macro lens behind glass: