Android N's stock dialer gives you the ability to screen calls as they come in

It's unclear if OEMs will adopt this feature, but if you use Google's stock dialer then you can look forward to some additional options when someone calls you while running Android N.

When you receive a phone call in Android N, you have the ability to reject the call, prevent the call from showing up in the call log, and to stop the call from showing a notification for the call.