I am pretty sure Canon tested the MKII for (a.o.t.) moist conditions, like any new camera. And I am pretty sure it passed this test, otherwise Canon sux in bringing this on the market anyway.
The only solution to stop the speculating and keep the mkII buyers (like myself) reassured, is for Canon to investigate this issue. Maybe there was a bad batch, maybe there is a design flaw (I don't care as long as it is fixed), maybe it was bad luck (wasn't there someone called Murphy on that boat?), and even maybe it is a bad camera . MR and his website do mean something in cameraland, and in this period of time Canon would be wise to give a satisfactory explanation.
I don't have any malfunction with my mkII, although I didn't use it in rain or heavy fog yet. But I did take it several times from the cold outside (below zero) straight into my warm house, without any problem at all (and not in a plastic bag, as Canon suggests). If this issue can be resolved, people can enjoy a terrific camera.
(PS: Hallo Ray)