I'll definately go for the UWA as long as it doesn't cost the same as a small car. Perhaps the 12-24 drops in price? Been looking at the Samyang 14mm(why don't you ever see one of those turn up used?), but a UWA zoom from 10mm would be wicked...I'm not overly impressed with my 50-200mm either, and a 100-300mm would be a nice upgrade. I'd also like something around 70-80mm.
I think Pentax could make millions if they just relaunched some of their legacy glass. Some of the prices 30+ year old lenses sell for on ebay is scary, ridiculous and tells me that there is definately a fairly big market for them, so...just make more of them, damnit!