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Ditto. This is the missing link in the m43 system. We know that Olympus is planning to release their 40-150/2.8 PRO lens sometime this year … and that's great. I am pretty sure this lens will have excellent IQ, just like the 12-40 PRO lens is … but it's still too short for bird photography. I wish they would accelerate their plans to release a super-telephoto zoom i.e. 150-350 or whatever, as that would rock! We know it's coming but let's hope it happens sooner rather than later.
At least the super telephoto is now on the roadmap here: http://www.43rumors.com/new-olympus-lens-roadmap-2/
I am actually hoping it is a prime and not a zoom. A 250mm f/4 would be a nice balance of length, aperture, and size and would be my vote.