Recently I looked over our packages again and I just remembered that KDE on Windows still misses some good picture viewers (No, Marble is not yet good for that task ;-) ). So I decided to look at kdegraphics a bit more as gwenview was still not building. I just recently wiped out most errors out of my exiv2 cmake buildsystem patch and now I wanted to try that out. And so I did - the result is that along the windows 4.1.2 packages you will find gwenview.
If I find some time in the coming days, I will try to work on digikam; we won't be able to get the gphoto support on windows in the near future, but I hope I can get that part optional so that we can have at least a starting point.
p.s.: The packages won't be ready before sunday evening I guess.
p.p.s.: Here is the proof: