I inspected most major areas, and only the new spawn city/castle appears to have been affected by the fixes.
If you, or anyone you know, plays or plans on playing, GET IN AND CHECK YOUR SHIT NOW.
I will be able to export from MCEdit and import, but I need the /locations of any chunks you see missing (assuming they had anything on/in them of any consequence.)
This means that even if you or they are not active right now, still jump in to check out your stuff soon.