New Hexacore Mac Pros Next Tuesday?

I'm getting tips in from sources who claim that Apple is set to revamp its high-end Mac Pro line, adding a 'hexacore' Core i7-980x model to the line up.
All information points to this happening next Tuesday, March 16th.
Apple, however, has typically used server-branded Xeon chips in its Mac Pro line, and Intel is also expected to debut a number of new Xeon 5600-series chips on that day. In particular, the Xeon X5680 rumored for release on Tuesday is very similar in many respects to the Core i7-980X and could also be a candidate for inclusion in the Mac Pro.
