They are claiming that heat is not really an issue, in reality the 1DX "should" be hackable and not have the heat issues too.
The thing stopping them there is Canons legal team.
I wonder how long it will take before Canon come down on ML for releasing this.
It could put a large dent in C100/C300 sales.
Well, if ML is doing a clean room reverse engineer of the camera, that should be perfectly legal. He isn't doing anything that helps 'circumvent' safe guards....like people have come down on gaming mods for. This hack doesn't allow you to circumvent copyrighted material.
One is allowed to do what they wish with hardware they purchase (at least still for now, although the corps are trying more and more to infringe on that)....so, this should be perfectly legal.
However, Canon can still throw legal threats around if they wish, whether they have merit or not. These days, it doesn't matter if you have a legal case or not...it is deep pockets that often win.
However, if Canon were to do this, the "Streisand Effect" might take place, especially if he's released the code open source and other people take the code and join in the efforts. Canon might get more spread and publicity of this type code rather than stiffling it.
But generally, if you're doing a clean room reverse engineer on hardware you bought and own, with no NDA's signed, etc...you should be perfectly legal.
If Canon legal comes knocking on ML's front door, I'd say first thing he might do, is contact the EFF and try to get them on his side with their legal help/advice.