Nice sarcastic response, totally unnecessary given 16 cores vs 8 cores is clearly going to see a performance boost. Not to mention the hyperthreading, so 32 simultaneous threads on a 16 core machine vs 16 on the 8 core machine. That is a performance increase worth paying for. This current interim update which is merely to transition onto the Nehalem architecture is a joke.
Still don't want it?
Waiting for 16 cores is in no way the same as crying over the case being the same.
Buy an older 2008 Mac Pro at a discounted price, or wait for the 16 Core behemoth that is due to arrive later in the year/early next year is my advice.