For me, the only difference between mkv and BD is menus. As much as I like the idea of menus, it is the content that is most important.

So, if the choice was between mkv now or a later BD (that might still be rushed and have to be modified), my preference would be for mkv. I don't just mean for the movie, but for the extras as well.

When the dust finally settles and everyone is happy that everything is the best it can be and no more changes required, then perhaps a final BD with menus and all extras can be created when Harmy has time.

Of course I will be happy with whatever Harmy decides to do as he is the one putting in the effort with time constraints and it is much appreciated. A BD with as many extras as available now and a supplementary disc of extras later is completely acceptable too.

As I said, it is all about getting the content: there are ways to reformat material for those who prefer simple BD structure instead of mkv (albeit each element would be its own BD). Plus, given a swag of mkv, it is not that difficult to convert them to m2ts and provide the menu files as a separate download that, altogether, could be burned as a complete BD.

I kinda think too, that releasing something basic where the end user may have to make some effort to get it how they want it, keeps attention off the studios: if it's released as a complete, beautiful Bluray that looks like a finished commercial product that anyone can easily grab, then perhaps the studios might take notice.

It would be unfortunate to create a finalised 2.1 BD, only to discover that something was not quite right and have to be corrected and then the whole thing completely downloaded again.