Here's the thing, if a dealer can reflash the truck, and a dealer has to be able to reflash the truck, then it's just a matter of pulling the data off the PCM and figuring out what's what. This is exactly how it was done with the 6.4L and the 6.0L before it.
The way it works is that the OEMs are constantly improving the engine managemant, and in the process, they add and change the control parameters to suite each specific application. Each application gets a specific "Strategy". Minor strategy updates will result in the strategy changing from let's say AAA0 to AAA1. But if a major change is required something significant like a full emissions rework, then the strategy will change from AAA1 to BBB0.
When the 6.0L replaced the 7.3L the PCM also changed from the older EEC-V to the Black Oak family of processors. The old EEC-V was pretty sophisticated for 1994, but it didn't have the processing power necessary to control 5 speed automatics, CVT automatics, hybrid power units, variable geometry turbos and variable cam timing that was being added throughout the model range. The Black Oak has roughly 10 times the memory capacity and is significantly Faster at interpreting and processing data.
The same was the case with the Seimens developed 6.4L PCM, and I would expect the same to be true with the forthcoming 6.7L. It's just time to sit back and watch because no matter what Ford or Dodge or GM put out there, there is always someone willing to put forth the effort to crack the code and figure it out.