With the recent updates to the iMac range It was expected that Apple would act on orders placed days or even hours before the update, but what iMac buyers weren't expecting is that Apple was going to offer a free update from your normal iMac to the Retina version, but that's how it happened.
A change to ... better?
The change may appear to be positive, and it is for the vast majority. For the same price you get the best screen on the market with more than 14 million pixels, more processing power and more up-to-date hardware, which makes us suppose that you have to say yes without hesitation. But there is one factor to take into account: the iMac Retina has AMD graphics and the non-Retina has NVIDIA.
A priori the AMD graphics (Radeon R9 M290X) is not inferior for the vast majority of tasks to the NVIDIA (GeForce GTX 780M), but the AMD graphics does not have the CUDA technology, Therefore, those users of certain Adobe applications that make intensive use of said GPU acceleration may be wondering if it is not better to keep the order placed and not update.
In short, the change seems totally logical For all those who do not necessarily need CUDA, and as an iMac Retina user that I am, I can say that once you try the 14 million pixels there is no way to go back, exactly the same as what happened to all of us with the iPhone, iPad, and MacBook Pro.
Well luckily from Adobe cc OPENGL is allowed so it is no longer necessary to depend on an nvidia to take full advantage of Adobe!