Updated July 7, 2017: Marvel has released a timeline showing how it arrived at the Legacy numbering for Invincible Iron Man - which also corrects their 2001 renumbering for Invincible Iron Man #500 - counting three older issues it didn't before (see below). Invincible Iron Man will now resume its classic numbering with #593.
Original Story: Brian Michael Bendis and Stefano Caselli are continuing with Invincible Iron Man into "Marvel Legacy," renumbered to #593 and beginning with the disappearance (and eventual return to the armor) of Tony Stark, according to IGN.
"Well, the theme of 'Legacy' was already very strongly in the forefront story of the Iron Man series. Not only has Tony’s mantle been passed on as he lays in a coma, but it’s been picked up by Riri Williams, a newcomer and relative stranger, and Victor Von Doom… who is one of the great villains of all time anywhere," said Bendis. "On top of this, Tony had just discovered the identity of his birth mother and was just getting to figure some stuff out about himself and his legacy when the events of Civil War 2 came crashing down on him. So we have Tony’s legacy, Riri discovering her place in it, and Victor trying to reinvent his… and that's just the stuff I’m willing to say."
When asked if Tony Stark himself (as opposed to the Stark A.I. in comic books recently) will return as part of Invincible Iron Man's "Marvel Legacy" story, Bendis says yes - but with big questions.
"Yes. But in what shape? Or size? Or armor?," answered Bendis.
"I promise as unique an Iron Man story as has ever been told. All of these characters are in a unique and delicate place and what will come out of it is new and surprising stories for all."
Here is the solicitation for the first issue of the arc, anticipated to be released sometime this fall.
INVINCIBLE IRON MAN #593
Written by Brian Michael Bendis
Penciled by Stefano Caselli
Cover by Adi Granov
THE SEARCH FOR TONY STARK
Continuing directly out of the pages of MARVEL LEGACY #1 and the transformative events of GENERATIONS!
Tony Stark has vanished! The mystery deepens as Stark friends and foes must decide, finally, who will wield the power of Iron Man! All the contenders are in position, and all the armor is polished. There can only be one Armored Avenger! The path to the most startling Iron Man story ever begins here!