I heard Mitchell did very well at the Senior Bowl and might be CB1. Sounded like he held up in man coverage against those receivers just fine.
Agree with Joe that Hafley won't be in press man all the time, but we'll definitely see it more than with Barry.
As others have mentioned, every team plays zone, usually the majority of coverage is some kind of zone. It will be interesting to see how much zone Hafley calls, what kinds of zone he calls, and how it's disguised. (Execution is another question) I didn't get a sense that Barry disguised his coverages a lot, there were times it felt like it was varying degrees of prevent defense.