Evening,
I have a suggestion that is slightly different. I have a K5 and the senor/body combination is wonderful. In fact the entire sensor family is a real winner in my estimation - the K5, K5II/IIs, K-01. K30, K50 and the K500. Pentax is coming out with a new ASP-C and rumor has it a full frame too. Cost and capabilities are debatable, while the schedule has been rumored to be October through mid next year - who know, as I certainly don't. So, what to do?
I would go for the deal that was posted today - the K30 and DA 18-55WR for $499.
If it is indeed the WR lens - it goes for $200 (~$120 on ebay used), leaving the body at essentially $300 - virtually no downside. You are probably going to keep the kit lens since its sealed (nice to have for the outdoor rain storm). Shoot with the K30, until what every you are interested in is announced. Take a look at it and compare it to the IIs, wait a bit for the first set of evaluations and make a decision. You should always be able to get at least $200 for the K30 body at a minimum, so the maximum you have at risk is about $100 +/-, for probably 6+ months of use. Granted this all depends on what level of interest you have in the lens.
You might consider holding off on the new body until the price premium fades (~6 months after initial delivery). Whatever you decide to do, the K5IIs will be down in price, and you can make both an informed and intelligent decision.
Also, as you see lenses that you really want become available, you can pick them up and use them while you are waiting and watching.
Just a thought.....