Wow, that was a long post to support one simple point ;-)
And the plan is as follows (was even before your post):
Finish v2.1
release AVCHD first, as that will have the shortest rendering, authoring, uploading and downloading times.
render the larger BD video stream - author a simple BD with simple menu, lossless audio and only the some simple extras.
start working on ESB.
Keep working on extras throughout.
Release a bonus BD for the whole trilogy when it's all done.