Greg,
That article is incorrect. The "core portions" of VFP will NOT be open-sourced. The author made some wrong assumptions with the facts he heard. Alan Griver (YAG) has been very clear that the core will not be released and just the Sedna add-ons will be released on CodePlex.
>"Microsoft has announced that it will
open-source the core portions of the Visual FoxPro DBMS software to its CodePlex community development site. At the same time, Microsoft has announced that it will no longer be making new versions of the FoxPro DBMS."
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http://slashdot.org/articles/07/03/21/1548202.shtml