Looks like Sling TV has finally acknowledged that they're trying to get on the new Apple TV:
https://twitter.com/slinganswers/status/736639219456745472
The tweet says, " At this time we do not have any word on when we are going to be added to Apple TV. We are trying to get on that platform. SW." I follow Sling and whenever I've seen someone ask about the Apple TV before this, I've only seen them say something like "thanks for the request!" but never acknowledge that they're actively working on it. I've used Sling on and off for a while and generally like it, but have been held back mainly by their lack of an Apple TV app and their lack of local channels. This, along with that rumored antenna box they're apparently going to release, could make a good solution for me. I don't mind paying for something that puts local channels in the same app as other channels, in an interface that's consistent across all my devices. I'm interested to see how this all plays out.