I teased a couple screenshots of this on some forums and our Facebook page at about 4am. I went ahead and pushed out the code so it is now live on the site. The Production Dashboard now has a couple of graphs that show the weekly production trends for the Z06 compared to the Z07 equipped cars. It does a pretty good job of illustrating how over the last couple of months, the number of Z07 equipped cars has been increasing. It seems to have leveled off at about 30% for these last two weeks. While that doesn't sound like a large amount of cars, its a massive improvement from the previous months.
I have validated the accuracy of the data by comparing it to the window stickers. Even that odd spike in February where Z07's hit 50% for two weeks was accurate compared to the window stickers released during that time.
So head on over to the Production Dashboard, scroll down to the Z06 vs. Z07 section and take a look.