You definitely may expect more Reyes in future, yes. I would really like to write his character! But don't expect him in any of soon coming updates, because they simply have nothing to do with his own storyline, apart from some rare mention.
He will appear in McCree's solo story, as well as in main storyline once it's added. Also him and Morrison will have their sepparate (short-)story in future, because we want to talk about their love/hate relationship :}