Everyone....
There isnt an incoming player who doesnt have a shoe deal. If Eric Griffin signs a contract w/ a NBA team, a shoe company is going to sign him too.
There are 3 basic types of deals:
Merchandise deals (free clothes and shoes). Every player in the NBA gets these deals unless they dont want them and want to have brand choice (John Wall is currently one of the only player doing this as he is looking for a signature deal).
Cash deals: Players who actually get paid to wear brands and will get PE (player exclusive colorways). Exum has this because he was super hyped entering the draft. I think he had a PE colorway of the Crazylight 2015's. Companies will sign the big time rookies pre-draft and put incentive structures in that pay more if they land in major media markets.
Signature deals: Few players get these. This is when the company plans to invest a lot of money into you, putting out your own signature shoe. Some players will go to Chinese brands to secure this deals. Klay Thompson has his own signature line with Anta, Dwayne Wade with Li-Ning, Tony Parker with Peak.
I would guess Mitchell got a cash deal because he is a lottery pick and an athletic guard. If he plays well enough he might get his own PE, but he will not get his own signature shoe unless he becomes a super-star, especially in Utah.