The Mac mini is available with a 2.5 GHz dual-core Intel Core i5 with Turbo Boost speeds up to 3.1 GHz, 4GB of memory and a 500GB hard drive for a suggested retail price of $599 (US); a 2.3 GHz quad-core Intel Core i7 with Turbo Boost speeds up to 3.3 GHz, 4GB of memory and a 1TB hard drive for a suggested retail price of $799 (US); and a 2.3 GHz quad-core Intel Core i7 with Turbo Boost speeds up to 3.3 GHz, OS X Server, 4GB of memory and two 1TB hard drives for a suggested retail price of $999 (US).
As a BTO option, the top end non-server model can support Apple's Fusion Drive. All models are shipping now.
It's been a while since the Mac mini got some love, but seems a solid update for Apple's most affordable Mac.
Apple