After battling Apple for almost 2 months, back in January I convinced them to give me a brand new one. I had a 1TB drive in my previous machine so I made them custom build me a rMBP with 1TB flash inside of it and bump me to the highest spec processor wise. It took a long time and multiple levels of management of back and forth talking to, but I was successful. I advise everybody to just keep escalating it all the way up to Senior Apple Customer Relations. Those guys are very pleasant to deal with. During the whole process they even called me on Christmas Day to wish me a Merry Christmas and told me that they were continuing to work on it. Excellent customer service at that level.
Is good result, equally I rather feel that Apple should have been forced to implement a new for old program, as they are making rather a habit of dGPU failure with the 15" MBP. Although the systems concerned are now ageing, many suffered issue relatively early on in the notebooks lifecycle.
We still have one 2011 15" and it`s still going strong, many equally others have not been so lucky. Apple really need to get the engineering right first, the 15" MBP has struggled with it`s thermal envelope with each iteration, nor is there any real need to "thin" the system further on the next redesign (Skylake), as this only results in high power components running at elevated temperatures and subsequent potential for premature failure.
Q-6