$5,000 burning a hole in your pocket? Apple's 12-core Mac Pros have been added to the store just now. Minimum spec includes two 2.66GHz 6-core Xeon Westmere processors and 1TB of storage.
Minimum specs start at 6GB of memory, an 18x double-layer SuperDrive, and ATI Radeon HD 5770 with 1GB GDDR5. The overall design hasn't changed since the previous incarnation, with the biggest overhaul happening inside the aluminum case—the 45nm Nahalem processors have been ramped up to 32 nm Westmere processors.
Order now, and it'll ship in 7 - 10 business days. [Apple]