The Mars Volta released what would become their potentially final record Noctourniquet in 2012, and a few months later in 2013 promptly broke up. The duo reunited in Antemasque a little while after the breakup, and in 2016 got At The Drive-In back together for a new record. In 2018, Cedric Bixler-Zavala said The Mars Volta "will be back soon," and now it looks like that's actually happening.
According to a few deleted tweets written about by Consequence Of Sound, Bixler-Zavala said there will be a new chapter in the Mars Volta's book, adding in a response to a fan that they're "in the kitchen finding new ways to through curve ball." A tweet made earlier in May also made mention of "[being] in the studio working on music w the Puerto Rican Bernie Sanders," which Consequence Of Sound points out is a moniker for Omar Rodríguez-López.
The most interesting aspect of this is going to be if ex-Red Hot Chili Peppers guitarist John Frusciante rejoins the group. Frusciante played guitar in varying capacities on The Mars Volta's albums between De-Loused In The Comatorium in 2002 and Octahedron in 2009.