The first article from the announcement today (that I've found) is from Mary Jo Foley:

At the Microsoft Most Valuable Professional (MVP) Summit in Seattle this week, Microsoft officials shared Shared Source news with the Visual FoxPro faithful and other attendees. The latest: Microsoft plans to release by the end of this summer the Foxpro "Sedna" bits as Shared Source on its CodePlex code-repository site.

Read the rest here