While I haven't decided, I think that I would give my K-7 and genuine grip to my parents if they would want to buy the 18-135 at the K-3+18-135 kit cost.
I was thinking about keeping it, but I really want my family back in the States to have a decent camera/lens kit so they can share more about their lives with me since I moved to Finland.
I've loved my K-7, but its low light performance doesn't inspire confidence. And it is crazy dark here for a large portion of the year, so the ability to shoot at higher ISOs and have a) cleaner files and b) better AF make me want to upgrade. I really want to be able to capture better images OOC in both indoor and outdoor low light conditions. I know the K-5 was very much superior to the K-7 in that regard, so I can only wait for some more in-depth reviews of the K-3 to sell me
Then the K-7 can retire to brighter pastures