Another report from admiringlight.com - at Photokina Olympus has on display a 300mm f/4 and 7-14mm f/2.8 prototype lenses:
These two lenses were unfortunately only on display behind glass, rather than available for perusal. The Olympus employee noted that they were only mockups, rather than working lenses. The finish on these two lenses appears identical to the other two Olympus Pro lenses, and the 300mm f/4 looks to be roughly the same size as the 40-150mm, which isn’t too bad at all. The 7-14mm is rather large in comparison to the slower Panasonic 7-14mm, but otherwise looks to be well-built and functional.