I hope the people at Magic Lantern get their hands on this and reverse engineer the technology for the 1DX and 5DMK3.
Last I read, they have no intentions of ever bringing Magic Lantern to the 1DX, and explicitly stated they will never attempt to hack it to become a 1DC.
And I agree completely. It's not really a gentlemen's agreement, being one sided and all; more like a gentlemen's nod. As long as Canon doesn't try and stop them, and they've been WAY more generous in that regard than Nikon would ever consider, the ML team has no intention of pushing too far. Turning a 1DX into a 1DC in firmware would be too far.
They're (ML Devs) even speculating that a few "suspiciously convenient" hooks were left in recent Canon firmwares just for them. Which if it's true, means Canon isn't just turning a blind eye, they're passively assisting. That's huge, and bodes well for the future of ML. And shows that Canon sees the benefit of having them around, much like a robust 3rd party ecosystem benefits them.