You're right about my encoder vs. the mastering house - I have absolutely no idea if it would be the same or not (and if not, how different). I simply wanted to put the idea out there.
You are correct that so far, Cinavia is only being applied to the lossless track. So, I guess it would have to be compared in some way (encoding it to match the other lossy Blu-ray audio on the disc, or not) to the lossy audio we have available, but alas, you are correct that we won't know if we'd be doing it the same way the authoring house would.
I suppose we'll just have to wait it out and see what happens. Maybe some info on Cinavia will be leaked, maybe some audio experts will come up with something once more discs incorporate it, I don't know. I'm sure I wouldn't be able to hear the difference between a track that has it and a track that doesn't. The difference between the two can't be that obvious, if it's audible at all. But, I am a curious guy, so I want to know anyway (if it's audible or not).