New heat sinks showing up in repaired 360s

Some 360s that have been coming back repaired by M$ lately have been sporting a new heat sink. Speculation is that the new heat sinks are there to combat the red ring of death problems that lots and lots of people have been reporting. M$ has never been very forthcoming with comments regarding red rings of death and they are similarly mum on the heat sinks too, neither confirming nor denying that the heat sinks have anything to do with RRoD problems.