hi,
just a few words to say that I'm on a macbook pro retina 15 inches from mid-2012, and experience many many GPU panic since I updated to yosemite.
My macbook being under warranty, I called the support and they didn't make any research except "you need to go to an apple service retail".
Since then, I read about the potential bugs, including this post, and I found out that a software called gfxCardStatus helped me to identify the bug : you can chose one of the integrated GPU or NVIDIA (in my case), or automatic (default behavior). When I chose integrated, I yet (only a few hours) no longer got any bugs. If I chose "dedicated" (which is nvidia GT650M in my case), the computer crashes and once rebooted says "there was a graphics issues".
Just my few words to tell others that you're not alone 🙂
Apple, any plans to fix this on a 10.10.1 ? I have a $ 2000+ macbook, with an applecare, and I feel like getting NO SERVICE from you !!