Saw this on the 4/3 Rumors site (http://www.43rumors.com/ft3-olympus-300mm-f4-0-lens/)... Olympus considers to make the new 300mm f/4 PRO lens with OIS, to complement IBIS in Olympus bodies (which is less effective at really long focal lengths) and also be attractive for Panasonic users. I know, it is the first for Olympus, but then it is going to be very specialized, and they have decided than without Panasonic user market it would not have enough sales to pay to its development, and that was the cause of its delay. Lens construction is 17 elements in 10 groups, 2 SuperED elements, internal focusing. Only ascribed a 41-60% chance to be true (so, 50/50... take it for what it is...), but if it is, enhanced stabilization as well as sharpness to hopefully at least equal the other Pro lenses would would be very interesting for hand-held use. I wonder what the impact would be on weight and cost, though.