Hand me a free K-3 (or whatever they'll call it) and I'll upgrade, lol. Well, I won't throw my K-x in the trash but I'll relegate it to second body, how's that? But no way I'd just go out and buy the new one for kicks. I don't have that kind of money. The fact that I even have my K-x now is a bit of a miracle.
If I suddenly won the lottery? I'd buy a K-5, probably a K-3 too when it comes out. At that point I might even find someone to give my K-x to. As much as I love it at that point I wouldn't need it. (Maybe I'd even buy a few K-5's for a lucky crew of folks on here, grin.) But I don't feel the need to upgrade just to upgrade. I do need a second digital body, doing professional work I think you need a backup plan, but 2 is all I can ever see myself owning in so far as digital bodies are concerned. Three or more cameras that cost that much would be a real luxury unless I was stinking rich.
The K-5 is honestly more camera than I need except for the whole WR thing which I do think would come in handy. I want one, but I could do with a lesser camera for my 2nd body really. I don't need an upgrade for that so much as I just need a comparable backup camera. I like to be able to take it out by the ocean and in the rain to shoot sans worry. I'm a little nervous about putting that much stress on my K-x. It's been factory serviced once. So far, so good, knock on wood, but I don't think I'd chance dunking it in a stream or taking it out during a storm. I think that would be pushing my camera too far.
K-5 I wouldn't have to worry about much, that's for sure. But probably I'll end up buying a used K-r to go with my K-x and that will be it. I was saving up for a K-x. I still have a piggy bank designated for a K-r or similar. Maybe there's a used K-7 or K-5 in my future instead, who knows? I'm fine till then though. I think I am ahead of the game actually with my K-x. I didn't think I'd have one yet so...