Here are the things that I'm excited for in upgrading from my K10D:
- improved AF (already fast on my DA 40mm Limited, can't wait to see how it is on the K-7)
- brighter viewfinder
- 100% view!
- per-lens AF tuning
- improved matrix metering
- much nicer high-res color-adjustable LCD (maybe actually usable)
- the dr expansion feature
- In-camera hot-pixel mapping (had to send my K10D to pentax)
- higher ISO ranges (and hopefully cleaner ISO 1600)
- AutoWB fine-adjustment even when WB is set
- intervalometer
- much more jpeg customization — handles 95% of what I'd do with a desktop-PC-based RAW converter
- speaking of which: "★★★★" setting for JPEG images
- smaller and lighter
- built-in flash 40% more powerful
- the level. I'm not ashamed to admit I'll turn on the auto-correction.
Wow, that's a long list. And the K10D is already a great camera.
Oh, and occasionally shooting a short video will come in handy. Same with live view, and the faster burst mode.
And more megapixels is okay.
If I had a K100D or similar camera, I would also be glad to add:
- dual-wheel control
- the better white-balance customization options
- the freakin' portrait/landscape orientation sensor. worth $300 right there.