Finally after 8 revisions, it seems my iPad air 2 with iOS 8.1 keeps VPn connection on! Even when hours of sleeping the device keeps the vpn on when awoken! This is a big surprise!
My VPN is dynamic ip and if my air 2 vpn connection disconnected and reconnected my ip would change each time but it doesn't at all. I left it in for 18 hours still connected to even when iPad air 2 is sleeping. This is most welcome new feature or "it's been way too long" apple feature.