If there's any merit to the rumors of Abrams doing tests to try and recreate the look of the film grain from the OT, then I would hope and expect that level of fetishization to extend to all other aspects of the cinematography as well.
So, if they're to stay as close as possible to the look of the OT, we should only see a flare whenever there's an explosion. It should look unintentional, as it most likely was in the original films.