AMD published the first part of a Q&A session about upcoming server platforms on the company's blog, you can read it over here.
Will AMD be the single chipset source for server main boards in the long term?
AMD plans to release the SR5690 chipset later this year. That will be utilized with existing Socket F processors as well as the future “Maranello” and “San Marino” platforms. We can’t speak to the plans of other companies, but we welcome any additional chipset products from other vendors; competition always breeds the best innovation.