When the Z/28 was announced. they stated it would be available Spring of 2014. If they follow the same procedure when the ZL1 was first released (1st quarter of 2012) then official ordering will begin sometime in the Fall. Hope this helps. But, if I were you, I would find a reputable dealership that will have an available allocation(s) for one and get on the list early if you want a chance at getting one.
2015 CRT 1SS/1LE RS/Recaro's/NPP/Nav/Rear vision pkg./BA speaker upgrade.
ARH 1 7/8 headers, CAI, BMR 1.25 drop springs, JPSS Billet Bushings ...421 whp...so far.