My gut feeling is that the base C7 and the Grand Sport will be as they are currently. No changes.
The base Z06 will receive the new front fascia and a small spoiler(similar to the current Z06's). That will differentiate the Z06 from the grand Sport, appearance wise, plus solve the overheating problems.
Z06 stage two will have a larger splitter and a small wing.
The Z06/Z07 will receive the new front fascia and the big rear wing, larger front splitter, etc making it more of a track car than the current Z06/Z07. Very possible a DCT(with the transmission behind the differential) will be in the Z06/Z07(DCT that will be shared with upcoming mid engine car; Caddy and/or Corvette).
I don't see any changes in horsepower in any model. Gotta' save something for the next generation, along with all new body panels.
Originally Posted by jschindler
Look at the 2008 C6. They upped the power and made a number of changes that effected the transmission, steering and a few other refinements. But the styling inside and out was essentially unchanged.
I would expect similar types of changes for '18.
They did up the horsepower in 2008 from 400 to 430/436 for the 2008 models, but they also increased the displacement from 6L to 6.2L. When they designed the LS3 6.2L they made significant changes in the block's design so that it would be the base block to be used for the ZR1 LS9 in the following year(2009).
They did not up the horsepower just to up the horsepower to improve sagging sales(as the C6 sales were not sagging in 2006/2007, when they were preparing for the 2008), but to have a stronger block for the 2009 LS9/ZR1.
Of course, increasing the displacement from 6L to 6.2L resulted in a nice horsepower bump.
Same with changing the transmission across the board from the T56 to the TR6060 in 2008. The TR6060 was not needed for the 436 HP Base C6 or the 505 HP Z06's in 2008. That too, was in preparation for the higher horsepower/higher torque LS9.
They did make some other "under the skin" changes like with the steering for 2008, but they also improved the steering again in the 2009 models as well as other improvements that were used in the ZR1(rear half shafts for the Z06) in the 2009 models.
Product standardization across the different model lines.