> Finally, in the interest of transparency, the Titan M firmware source code will be publicly available soon. While Google holds the root keys necessary to sign Titan M firmware, it will be possible to reproduce binary builds based on the public source for the purpose of binary transparency.

and

> Transparency around every step of the design process — from logic gates to boot code to the applications — gives us confidence in the defenses we're providing for our users. We know what's inside, how it got there, how it works, and who can make changes.

This should be a boon for security researchers! I'm really looking forward to what comes out of fuzzing that whole subsystem. I imagine attacks against the secure enclave would be a lot easier to perform (and ideally, report to Apple) if it was feasible to attack it with pure software.