Looks like I was wrong. This was demo of bigger GPU, Polaris 10. At CES they have shown Polaris 11 which is smaller, and less powerful.
So this is supposed to be 232 mm2 125W GPU. Still impressive.
The question is will Apple implement or already have done it so on their new rMBP?
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Did the prices of 2014 macbooks drop drastically before the March 2015 event?
Not really recall, but I believe they did that last time and almost everytime they were announcing new keynotes.