You must update your Apple TV software in case if you updated your iPhone/iPad to iOS 8.x, otherwise you may encounter some issues in AirPlay connectivity.
New Apple TV update brings these features:
- Refreshed User Experience
- App icons are rectangular and has better depth of colors now.
- Family Sharing
- Your Family members can watch the movies or play the songs you purchased on iTunes account.
- Ask to Buy
- Now children can ask for permission from parents to buy items from iTunes