Chuck pointed out this Newsarama article on upcoming changes to Green Lantern, with emphasis added by me:
Ivan Reis, who's been the Green Lantern penciler since 2006, is now the artist on the Blackest Night mini-series, working months ahead with Johns for the July launch. And as Reis told Newsarama at New York Comic Con, the last issue of Blackest Night will mark the end of his run with the Green Lantern characters, although he said his next project (still unannounced) will reunite him with Johns.
"It is so much fun to work with Geoff. And if I can work with him for 10 years, I'll do it," Reis said.
Now, we've been told that former Legion artist Francis Manapul is the artist on the new Adventure Comics, which is supposedly Geoff Johns' next project. So either the Reis comment is for yet another new book for Johns, or Reis is replacing Manapul on Adventure.
I have no idea which (if either) of those is true, but that won't stop speculation. Anyone have any more info?