I have never known Chevy to be quick about anything along this line; as an example I offer how quick the GMPP Supercharger for the 3rd Generation Cavalier was released. I am sure it was not much more than two years from the date of the official announcement, which followed at least two years of leaks and rumors. But at least it came to market before the last Cavalier rolled off the assembly line, I think.
That should be enough to give us all hope.
Laborsmith