The Bulls have been trying to move up in the draft to get an elite shooter. Their target has been Denver with an offer of the 16th and 19th pick for 11. If they get there, Gary Harris or Nik Stauskas will be the guy with them, likely leaning toward Stauskas.
It's good to have backups, since there's at least a decent chance that one of them gets taken in the top ten, but it's unlikely both go. It's surprising to a degree that Stauskas would be the choice. He's a little slower and a little more ball-dominant. But he's also extremely crafty. Either option would be good.
Denver has been making noise for the past two months, since they effectively fell out of the fifth spot when the Knicks went on a brief, useless winning streak, about trading out of their pick. No. 16 and No. 19 is a pretty good haul even if it's not going to land them a elite player. They pick up a wing and a big man in those spots (Adreian Payne might be available there) and if they were to package those two picks with Kenneth Faried, they could really fetch something.
So Denver wants to move, and Chicago wants to move up. It's rare that deals that get floated this early actually happen, but it's out there.