I hope it will be the 16's I don' want to wait for a 17'
you're gonna have to wait... earliest we'll see the new engine is 2nd quarter 2016 calendar year...at least a year away from right now.
They can continue to produce the LML engine until December 31st 2015. They can still sell LML's in 2016 , just cant produce them per new EPA regulations.
So GM will stockpile LML's, shut down production on January 1st, retool the factory january/february 2016, and then start production of the new duramax (L5P) after they're done retooling.
They wont be producing any engines for that ~2 month window while retooling, which is why they will stock pile LML's before December 31st...so supply will hold out demand for the time when they are shut down/retooling.