Just to verify, is this what you're planning?
1) Lower-bitrate AVCHD DVD9
2) Higher-bitrate MKV
3) Possible Blu Ray (same encoding as MKV, maybe with some extras)
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.
Is that how you see it happening (at least right now)?