Whitey - 11:48 pm on Feb 29, 2012 (gmt 0)
and less likely by someone making an innocent citation
Provided these come from authoratitve sources , like a recognized new article, they are going to be more credible and would likely pick up on the surrounding text and validation signals.
Over optimized anchor text [ internal and external ] is probably an irritant to Google and it's quality guidelines, since it is not natural linking.
But i doubt if either of these were touched in this update.