Official comment
@Rob > The CDJs don't have wireless ability, and there's a reason for it - reliability. We want to ensure that the data sent over the ProDJ Link is not interrupted due to interference or poor quality signal, so a wired network is the best choice. There are many other technical reasons why it wouldn't be appropriate to use an ad-hoc wireless system to connect the players to a laptop, but I'm sure you'd also appreciate not paying more to have wifi in the already expensive CDJs.