I'm sure if they had a reasonable date they would provide it. But what good does forcing them into providing a date do? You will just be even more upset when the new date comes and goes. If they had a date to provide they would have already given it.
My advice is to seek alternative software and tune the vehicles that you have waiting. Make the money while you can. Then when the LS-2 stuff is released, you can sell the other and more than likely still be money ahead all things considered.
Then again these could just be the ramblings of someone who has inhaled way to much Duramax smoke....................