I did graduate studies at the University of Paris 1 Pantheon-Sorbonne. My French is sufficient to read the article. The author of the article speculates that the Haswell rMBP will get the 755M, but most certainly does not claim that the drivers in Mavericks so indicate. The author doesn't make any claim to support that belief other than saying that the 755M is the successor to the Nvidia chip in the current rMBP.
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The CPU and surrounding chips communicate by setting the voltage on interconnecting lines to 0V (to represent a zero) and 1.2V (to represent a one). All, yes all, of the energy needed to do this eventually dissipates as heat. Regardless, the energy consumed by these interconnect lines is a tiny tiny fraction of 1% of the energy consumed by and dissipated by the chips themselves.
I'm sorry to contradict you, I'm a French native. Even though I've lived in the States for too long to keep counting the years, my French is not rusty, they clearly make the assumption that there's going to be a dGPU in the future iteration of the 15-inch.
Let me translate if for you.
'Le 15 pouces est également doté dune puce graphique de NVIDIA et le nouveau modèle attendu pour lautomne devrait intégrer la GeForce GT 755M, successeur de la puce actuelle.'
> The 15-inch is also equipped with an NVIDIA dGPU and the upcoming model expected in the fall should include the GeForce GT 755M, successor of the actual chipset.
Before the actual model is released, we can only speculate indeed. But the author's speculation here is based on the codes found in Mavericks. It's the title of the article after all : Mavericks, indiscreet about the embedded graphic chipsets in future Macs.
Food for thoughts.