I don't think that's how it works Audi doesn't engineer it's parts for the needs of 3rd party tuners and waits till they finished messing with their ECU...
What I find a bit confusing is that Audi doesn't seem to see the necessity to comment on it's manual-only policy, as there seems to be quite a demand for the missing option.
If they can't communicate the reason for dropping the DSG or not having it ready after that lengthy timespan of testing I could imagine that some buyers will turn away from the TT-RS as they feel they can't get what they want.