They lost the communications downlink during the entry burn. I wonder if that is related to the landing failure. I noticed some smoke to the right side of the screen around the time of the landing burn starting, and then water droplets on the camera. I have a feeling stage one had a location coordination problem with the droneship.
The rocket doesn't need communications to land; it's autonomous.
I was speculating earlier that it was probably a soft landing on the water. SpaceX just confirmed this. Apparently the rocket is intact.
Probably not recoverable / reusable, but might be
Note that it's possible that the rocket deliberately missed the drone ship. It's programmed to do so if it doesn't think it can land safely . But it's also possible that it just simply missed accidentally.