Like jaguar said. The new sandy bridges come out with the Intel 3000.
The old ones should come with 2000.
No. That's not exactly correct... The Clarkdale Core i3/i5/i7 CPUs do not have any integrated graphic core. Those CPUs must rely on either the chipset (GMA 4500M) or a discrete graphics card.
All laptop Sandy Bridge Core i3/i5/i7 CPUs have the Intel HD 3000 graphics core. The Intel HD 2000 graphics core only exist on the "lower end" Sandy Bridge desktop Core i3/i5/i7 CPUs.