CatBus said:

I'm also assuming that, if I download the MKV, I could demux the streams and make my own barebones Blu Ray that I can live with until the fancy one comes out, and #2 and #3 would have the same video quality.

Only if harmy encodes the mkv with black bars so that its fits the 16:9 BD requisite format. Otherwise you'll have to re-encode.

Harmy said:

I thought about it. Possibly but I'm not decided yet. Maybe, similarly to what I have planned for foreign dubs, it could be available as a separate download that anyone can mux in themselves.

Separate, uncompessed audio sounds like a great idea.