Rumor has it that Intel’s first processor with integrated graphics, Clarkdale, will use G45’s graphics or one similar to it as well as a G45-based memory controller. Although this is still nothing more than a rumor, it might very well be true as it’s a tried and true method.
Additionally, two of Nehalem-based mid-range CPU’s will probably use different memory controllers, where Lynnfield might get a dual-channel version of Core i7’s controller.
I guess we’ll have to wait and see, as Intel’s still silent on the matter.