Both of the big boys in NYC have just announced via e-mail pre-ordering for the Panasonic Leica 100-400g lens!!! I hope I was one of the first to get on the list. Also announced and within 10 min's of the PL 100-400 announcement is the Olympus 300/F4. Which might be a smarter choice depending on your application. Zoom luxury or a faster aperture? F4 is fast, especially at an effective 600mm; but F6.3 for an effective 800mm is unheard of. Such a hard decision. We have the 40-150 2.8 Pro Oly and there is no doubt that the Oly 300/F4 will be a supreme lens in every way. Me, well I'm going with the Lumix simply because I have the GX8 that's been waiting on this lens.