Once again, Richard, I'm impressed with the ability of this lens. I would certainly be more than satisfied with them.
As for my own camera... both my wife and I have our own k10d cameras which came with the kit lens. We've only had them for two weeks now and are still getting to "know" its foibles and its strengths (which are many).
As for indoor shots... we're likely to take very few. Neither of us is big on indoor photography and we have small, prosumer cameras to fill in for that type of shooting. They're smaller, less conspicuous and have served us well over the past few years. Most of our shooting with our k10d cameras will be during our trips, our weekend outings and so forth.
We're currently planning our next trip (September) to Hawaii (been there twice now and it continues to call us back) and we want to travel reasonably light. That is why a "one lens" fits all would be a welcome addition to our current kit.
I'm in no real hurry on this so I'm willing to wait for the Pentax's release and to make comparisons then. Besides, perhaps it will have rebates down the road and/or the Tamron will lower in price. Hey.. I'm not averse to saving some money when I can.
It's increasingly becoming apparent that the 18-250 would be preferable to the 50-200 zoom. I've yet to hear anything to the contrary and that is also the direction in which I am leaning. I also like the idea of not having to change the lens frequently.
Any other comments?