rlange - 3:53 pm on Aug 18, 2011 (gmt 0)
They did not do jack.
I see big problems as well. It does not look like a fix at all 2 me.
The bug they fixed was very specific, dealing with new vs. returning visits only. A comment [l3analytics.com] I saw elsewhere claimed that it was the result of GA occasionally improperly updating the tracking cookie, making a visitor's first visit seem like a return visit.
This fix probably wouldn't affect much, if anything, else.