CNet is reporting that Apple's new Macbooks will not recognize a jail-broken iPhone. That is because it uses a custom-iTunes.
How is it accomplished? Apparently, if you put the iPhone into the DFU mode, the Macbooks will not recognize the iPhone. Educated guess by CNet and Gizmodo is iTunes.
So the irony is that it might still be possible to jail-break via Windows or an older Mac. But you have to give it to Apple. iPhone-Dev Team, your move...