This, along with bug bounties, would enable researchers to locate security vulnerabilities, and help Apple keep the iPhone secure. These aren’t the same iPhones that are used by developers inside Cupertino, but are said to be locked down a little. Steven Troughton-Smith speculates:
What could a pre-jailbroken iPhone from Apple look like? I would have to imagine it has debug symbols (+ no dyld cache) and the ability to attach a kernel debugger, maybe even SSH, and is surely very securely provisioned and locked to your dev account with strict usage rules? Steve Troughton-Smith (@stroughtonsmith) August 6, 2019
In the right hands, this could really help Apple keep the iPhone secured. It’s going to be interesting to see if Apple does announce this program.