Just sent my K-5 back after a week of use after discovering the sensor stains. After advice from here I realised that the camera's inbuilt sensor detection does not pick them up but after a few 'snowy' landscape shots I saw them and checked further.
Well it has now gone back for replacement from Amazon. However, I am not so sure that the 'body only' packs are selling faster. The 18-55WR kit is discounted so much at amazon(uk) that for a very small extra amount of cash ($35), it is more of a deal not to be missed. This is proved by the fact that the Amazon.co.uk site is currently out of stock on the 18-55WR kit but has plenty of the others (body only and two lens kit).
I hope that this will be good for me!!! Due to the fact that it will be 3 to 5 weeks before they have stock, then I am hoping that I will get a stain free camera!
It seeems strange that Amazon seems expects to be out of stock for so long... I hope this is because Pentax are not shipping new stock until they have fixed the problem!
Normally Amazon are regarded as a key distributor and are given priority when it comes to stock....
I think there is more to be read into this fact.
Dave