There's a much larger issue to worry about then people accessing game files in the pre-load and leaking a few spoilers.Pre-loading a month before release sounds bad. I dont remember which game it was last year, but I remember some players leaked some heavy spoilers by accessing the game files.
I hope it wont be the case here.
Games already have a big problem with Store Employee's stealing copies and playing them early... Can you imagine what that would mean for a DRM Free title?
More OT though: I don't see the big problem, but it does seem insanely early to do a pre-load. A week before or so would have been fine, but a month is pretty intense.