This is great news! Zoom range was expected, and aperture in line with my expectations. If it is reasonably sharp wide open I will have no problems with that. The DC and WR features was unexpected for me, either has been seen in a Limited before. I think it will be a great standard zoom for the weather resistant K-mount bodies. No other manufacturer will offer anything similar to this (compact size, semi-fast aperture, premium build and WR), either in mirrorless or DSLR. Just to give an illustration of what the zoom range is capable of doing, here are two samples from other Limiteds

DA21, at 21mm obviously

The new lens will be slightly wider and faster than the DA21.

FA43, similar to tele end of the new lens. This was shot at F2.5 though, so as shallow DoF will not be possible.