Hard to make an offer with no starting point. New mounts are coming soon and I hear they're pretty cool so I'm thinking wings will be not as valuable. But a 100/50 mount is still awesome so I'll offer 2m gold or equivelent in even chests now or after the new event starts.
This is not my world, however wings are unique and may not be made again, the new horse mounts are ok but in my opinion I would rather have a set of wings or at least the 2m shop ones.