Did you think you were going to buy the lowest end Retina Display MacBook Pro (to save some money) and then just upgrade the hardware with your own later on? Ha! Think again. According to a recent tear-down by iFixit, Apple is getting insanely close to offering absolutely no aftermarket customizations by the end user. Just take a look at the motherboard image above.

The box bordered with a green color represents the new 2012 MacBook Pro