RedCardinal - 4:57 am on Nov 3, 2012 (gmt 0)

Fairly sure that JohnMu mentioned in a hangout that redirecting to a new domain would only work short term and that the algo would eventually catch up with the new domain.

This goes back a good few months, but if you spend time viewing some of the Webmaster Hangouts you can find some useful information from John's input.