Also, they're no longer using the Nvidia chip. They say it's because they decided that VT-d was very important, and the i7-4770HQ needed for the VT-d required them to use the Intel GPU.
Honestly, I prefer the Intel GPU. I don't play a lot of 3D games, and the Iris Pro GPU is so much faster than many discrete GPUs I've used, and the Intel graphics driver team actually tries to cooperate with the open source community. Unlike the Intel network driver team.
The chip this uses , the i7-4770HQ , uses vt-d. According to invisible labs[1], vt-d can allow certain malware attacks. Afaik, even after being informed of this by invisible labs researchers, intel did nothing(afaik) to solve this.