From what I see, it looks like John is getting some development. John being in the Justice League, which is one of DC's top books, is a good promotion for the character. It gives him more exposure to the point where it's possible that other writers can use him in guest appearances and even possibly a John Stewart solo that gets inherited from Scott Snyder's run.
I just hope John doesn't look bad as what Snyder did to Hal in the early issues of Metal.