Quote:True, but I have to add that the 150-600mm got a new optical design, and the 90mm macro just got a facelift.Yeah, so it's a 50/50 chance - dare I say the only certain thing is that nothing's certain?
I am sure a replacement of the 17-50mm will get new, better optics.
But I'm also wondering if they're going to release some other UWA zooms alongside this 15-30, which will probably remain their Crown Lens in this segment? Actually, scratch that - we can be sure they will release something, we just can't be sure what and when. 
I'd wager there's going to be a radical UWA along the lines of the Sigma 12-24 (though I'd rather see a prime in the 12mm vicinity) and a more moderate lens to replace the 17-35/2.8-4 (which I think is still a current lens - any chance for a review???) - smaller aperture (maybe straight f/4), 77~82mm filter thread, longer range...I guess we can just about count on the APS-C 10-24mm lens being replaced soon...