Dota 2’s upcoming heroes teased on update page

What are these things, and why can't they afford adequate lighting?

To the lower left there are three characters, a flying thing, a horse-mounted thing and a thing that’s probably annoyed because it can’t fly and doesn’t have a horse. To the right there’s a thing possibly peeking out from the shadows.
The things to the left look a lot like Gyro, the Chaos Knight and the Phantom Assassin. The thing to the right could well be Undying Dirge’s shoulder or skull. Dota 2 is due an update imminently, and we wouldn’t be surprised if the three or four poorly-lit heroes make an appearance.