It's been sometime since Apple has refreshed their Mac Pro line and the rumors are saying that the release might be sometime this year before mid 2010 and we could be seeing a new 6 core Mac Pro with Intel's new chip "Gulftown " The new Mac Pro has a likely chance of running Snow Leopard and after this release we could be seeing significant price drops on older models of the Mac Pro's.

Here's a picture of the current Mac Pro's offered by Apple: