- obey exif orientation tag

According to http://www.daveperrett.com/articles/2012/07/28/exif-orientation-handling-is-a-ghetto/ PreviewImageFragment obeys the EXIF orientation tag.
You are right.
But unfortunately there is no possibility to get Exif informations out of a Bitmap. 
The best solution I can think of is that we get the rotated image from the server. I thought I had created an issue regarding this a long time ago, but I cannot find it :S