Was at a jam session today and couldn't get my app to connect to the amplifi 500. I quickly remembered I had downloaded the iOS 9.3 to my iPad, used my iPhone (still on 9.2) and everything worked great.
I am hoping we don't have a repeat of iOS 9.0, but I am fearful we will. Hopefully Line 6 will be paying attention to this and be ready when the iOS 9.3 update drops!