Also seeing this issue.
The problem exists the other way. Windows machines cannot connect to MCPE on iPad's hosting a world.
I have this same problem. Since the 0.16.0 update to the Windows 10 beta edition our PC's cannot connect to iPads running 0.15.10. No update on the App store is available for MCPE.
I see this problem as well. When will 0.16 be release for iPad?