I am guessing it will just be sharded and hidden throughout the code in areas that get triggered as you play though the game.

The only real question is if it is quicker to find it in the code or to play though the game. IMO that is all a bit pointless as once it is cracked it will be cracked. All this does is maybe buy a few hours after launch (assuming the game files are not predownloaded before then) at best before all the info is available online. And now they have announced this quite a few will take it as a challenge and I doubt it will really slow anyone down.