Tom's Hardware reports Intel will talk about Larrabee at Siggraph this summer but it seems we shouldn't expect too much as the product is still far from being ready to be released. Currently, a high-end desktop version of Larrabee is slated for late 2009 and volume and mainstream parts for desktop and notebooks should be ready in the 2010 timeframe.
But, as it turns out, Rattner was only referring to a paper and technical details that the company apparently planned to release at Siggraph 2008. We spoke with several sources close to Intel and are confident to say that Intel will not release a paper that is going to detail Larrabee as well as how it will work with existing APIs http://en.wikipedia.org/wiki/Advance_Passenger_Information_System .
Larrabee itself, of course, is far from being ready to be released. Larrabee has not even made it onto internal product roadmaps yet, since those plans provide an overview of only five quarters. However, Larrabee is on the long-term roadmap and known as "The ****** Book".