I'm not very good formatting things... But, according to Adam Schefter:
@Adam_Schefter Not sure if this beats John Elway on Twitter, but the Broncos retained their OC Mike McCoy, who also could have gone to Clev or KC. 39 minutes ago
It seems like this might be good news. He's evidently well regarded and will provide continuity for the offense, which might be especially valuable this year. The Broncos, at least at times, had an effective passing attack over the last two seasons, so hopefully he can bring what he learned from having worked with McDaniels and can combine it effectively with the running and line coaches brought in the Carolina.