Has anyone been able to use gfxcardstatus to force integrated graphics on the new 15" rMBP and have it stay that way, without an app overriding it? I used to be able to do this a long time ago on my 2010 MBP, and I could even go so far as to force games to use the integrated GPU, but the functionality broke with an OSX update somewhere along the way, and applications make the final decision as to what GPU they want now. Unfortunately, Mavericks broke this even more, and text editors like Sublime Text are even forcing the dGPU, which is an issue when I'm trying to extend battery life to last through class (it forced me to take up vim). If anyone has a new rMBP with gfxcardstatus installed, could you please try setting it to integrated only and trying to run an application that wants the dGPU? Even if you don't have a game installed, even Photoshop or trying to watch an HD YouTube video should work.