The Intel HD4000 isn't soldered onto the logic board. ;-)
It's an embedded part of the sandy bridge chipset.
But that changes nothing about the non existing upgradeablity.
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On the other hand - the HD4000 is a quite potent graphics solution. Some tests shows that even crysis will run on appropriate framerates.
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I do personally play games like torchlight, diablo 3 and world of warcraft and these will run very smoothly without raising the system fan to the limits. Absolutely no comparison to the older HD3000 in my MBA.
The Intel HD4000 isn't soldered onto the logic board. ;-)
It's an embedded part of the sandy bridge chipset.
But that changes nothing about the non existing upgradeablity.