Part of the news in New York ComicCon is the information that G.I. Joe: Cobra co-writer Christos Gage has received an exclusive contract from Marvel Comics, which means he will be moving on from the fantastic IDW title.  His co-writer Mike Costa will remain on the book.
Announcing it via his Twitter feed, he expressed regret that he had to leave the book, but confidence that Costa can continue on fine in his stead.
As a humongous fan of G.I. Joe: Cobra, I’m sure Mr. Gage’s influence will be missed, but I wish him the best of luck, and a huge congrats on the Marvel deal!  Part of the Marvel deal is also doing the writing for the upcoming Captain America: Super Soldier video game from Sega (to launch in conjunction with the film) so I know we’ll all be sure to check that out!