The wording in the original document, as far as my laic understanding, does not bar nVidia from making chipsets for Intel even after Front Side Bus is dead, because both QPI and DMI qualify as a "processor interconnect", regardless of what either party is saying.
Intel filed a suit against nVidia in Delaware court [naturally, since both companies are incorporated in the "Venture Capital of the World" state], claiming that nVidia doesn't hold the license for CPUs that have integrated memory controller. nVidia didn't stand back, but pulled a counter-suit, but this time around, nVidia wanted the cross-license deal annulled and to stop Intel from shipping products that use nVidia patents.
If you wonder why this cross-license agreement is of key importance for Larrabee, the reason is simple: without nVidia patents, there is no Larrabee. There are no integrated chipsets either, since they would infringe nVidia's patents as well. Yes, you've read that correctly. The Larrabee architecture uses some patents from both ATI and nVidia, just like every graphics chip in the industry. You cannot invent a chip without infringing on patents set by other companies, thus everything is handled in a civil matter - with agreements. We heard a figure of around several dozen patents, touching Larrabee from the way how frame buffer is created to the "deep dive" called memory controller. If you end up in court, that means you pulled a very wrong move, or the pursuing company is out to get you. If a judge would side with nVidia, Larrabee could not come to market and well can you say - Houston, we have a problem?