Apparently,if you buy the first three singles you get the fourth one and the new album for free two weeks prior to release.(July). The same applies to Butcherettes and the Tremulant EP remaster.
http://nadiesound.com/album/antemasque

The fact that they are using the Mars Volta fb page and even use Mars Volta material for promotion kinda hints their reunion in the future,right? I feel like they're going to work on MV stuff again but they don't want to hype it up for the sake of promoting Antemasque.