Eiji Shirota responsible for product planning of M.ZUIKO DIGITAL lenses wrote a short text on facebook (Click here). He also hints that: “We are currently involved in planning and development of unique lenses with ever greater focus on high image quality and usability.” I hope he was not thinking on the 15mm f/8.0 lens when writing this :)
P.S.: The Olympus 75mm lens is in Stock in UK at Wexphotographic and in France at [shoplink 33262 ebay]PhotoVideo[/shoplink].