Hardware Canucks posted a review of the brand new EVGA GeForce GTX 260 Core 216 Superclocked Edition which uses the new GTX 260 core with 216 Stream Processors. A quote from the article:

I am sure that for many of you the title of this review comes as a bit of a shock since you were not expecting a revised GTX 260 for the next little while at least. Some people say that competition speeds development and in this case ATI's introduction of their new 4800-series has prompted a lightning-quick response from Nvidia. Not only have they drastically cut the price of their GTX 280 and GTX 260 cards but it seems like they are now allowing manufacturers to release "upgraded" versions of the GTX 260. This card will be meant to shore up the GTX 260's performance against ATI's HD 4870 in the short term with an extra 24 Stream Processors to give it a helping hand.

>> EVGA GeForce GTX 260 Core 216 (216 SP) Superclocked Edition Review