Since letters have gone out (still waiting on mine) and there is a Service Campaign number for it, it's obvious that GM is taking action. Yah, mine falls under it too. Unfortunately, after the Cobalt/HHR debacle, GM has to seriously cover their hind ends. Keep in mind, every one of these "Campaigns" has to be identified, a fix designed and verified, the bulletin written AND go through the legal department. If any changes have to be made, they're made then have to go through the process all over again.
There are several bulletins that have the information available, but also says "remedy pending" which means they've probably already made it through the legal process and now have to produce the parts, test them to be sure it's a good fix, then put them into production for several thousand vehicles before everything is released. The bulletin number for the Corvette headlights doesn't even come up yet which shows us where they are in that process. It's gonna take time, but at least the issue is being addressed. Covering your rear is big business and every aspect has to be reviewed before they can make a final decision.
I may be wrong on this part, but IIRC, since most of these cars were built under the "old GM" that went bankrupt, the current GM isn't technically responsible. At least they're doing the right thing.