While the news has not been confirmed by the band's website, it appears that The Mars Volta's insanely talented drummer, Jon Theodore has left the band.
Wikipedia tells us the following:
Amputechture and Tour
Amputechture (2006) The band has finished the recording of their third album, Amputechture, expected to be released September 12, 2006. Omar Rodriguez-Lopez produced the record and Rich Costey mixed it. The artwork was created by Jeff Jordan.
The Mars Volta
"An excerpt of a recent interview with Cedric Bixler-Zavala reveals more details on John Frusciante's work with The Mars Volta on their next record," according to www.frusciante.net.
"Chili Peppers fans will be excited to learn that guitarist John Frusciante has again been working with the band. 'Since Omar is producing it and recording it,' Cedric said, "he taught Frusciante all the new songs and Frusciante tracked guitars for us so Omar could sit back and listen to the songs objectively. It's great that he wants to help us and do that'."
The band is going on tour to open for the Red Hot Chili Peppers in a late Summer/Fall tour of 2006.
In addition, a remix album is in the works; however, nothing has yet been announced.
The song "Viscera Eyes," from the band's upcoming album, was recently added to their MySpace page. The song was added in two parts, however, because it is over 9 minutes in length. This has now been replaced with a radio edit, running at 4:21.
On July 28th 2006, the publicist for the band has said the following in a press release: "The Mars Volta cast that performed Amputechture will be modified for live dates that begin imminently, with drummer Jon Theodore replaced by Blake Fleming, formerly of Dazzling Killmen and actually the drummer who played on the very first Mars Volta demos. Pablo Hinojos-Gonzalez will expand his role, contributing both guitar and sound manipulation skills. Finally, while not a member of the touring Mars Volta band per se, Amputechture contributor John Frusciante, on the other hand, will be in close proximity, as his Red Hot Chili Peppers and The Mars Volta are scheduled to tour together through November 2006."
After their Fall tour with Frusciante's Red Hot Chili Peppers, The Mars Volta will launch their own headlining tour across North America that will last "well into 2007."