http://www.apple.com/macmini/

Available in Core Solo (1.5ghz) and Core Duo (1.66ghz) configs. Unfortunately, the new mini's don't get a dedicated GPU as before. Instead it uses Intel GMA950 integrated. I think the dimensions are the same, as well as the design. The only major exterior changes are the addition of 2 USB slots (4 total), and gigabit ethernet. I can't tell if it uses a full size HD, but considering the size, I doubt there will be one.