I don't think these are signals of an upcoming and imminent instagram app coming for WinPho. I think is just the hatred of facebook for windows phone what it's doing this. Also Google hasn't released any of its services for the platform, so I wound't be impressed if somehow they state firmly that they don't accept windows as a platform and that none of its service are gonna be available for windows users but android and iOS users. Indeed, we don't have an official facebook app since WinPhone 7.5 release, and yet we just have what "tries to be" a great facebook app in developing by Microsoft's team and its partners...
Posted via CB10
I wouldn't worry about it too much, to be honest. Instagram has already started to back off as it seems to be affecting WP8 users as well. Facebook owns Instagram, they have their own problems. The time it would take to start policing various platforms for permission to post to Facebook would not only be time consuming and costly, it would also damage the FB platform... They were overzealous, it will be corrected soon.