Google Play Game iOS Services GPGManager validOrientationFlags is deprecated. Replaced?

I am developing an iOS landscape game in iOS 8, and am using the latest GooglePlayGames SDK v3.1.

In iOS 7, the Welcome Back Toast message is rotated correctly, but in iOS 8, the Toast message still gets stuck in portrait mode.

I understand that the deprecated GPGManager flag is deprecated in the new SDK.

Any ideas on how to rotate a Toast message in iOS 8 to landscape? Much appreciated.