Other than Thunderbolt, new Mac mini also come installed with faster new processors, graphic cards and Mac OS X Lion. The Thunderbolt on Mac mini replaces the mini display port. Mac mini retains the size and form factor of the previous generation of Mac minis but one striking change to the exterior is the omission of optical drive.
Apple has made notable changes in the models available. Or one could put it as Apple has gone back to the original price point and two model option similar to what it was before the current generation of Mac minis. Mac minis are now available in two versions. The entry level Mac mini with 2 GB RAM, 2.3GHz dual core Intel i5 chip, 500GB Hard disk drive and Intel HD graphics 3000 processor with 288 MB of DDR3 SDRAM is priced £529 ($599). The other Mac mini comes with 4 GB RAM, 2.5GHz dual core Intel i5 chip, 500 GB Hard drive and has a superior AMD Radeon HD 6630M processor with 256 MB of GDDR5 memory and is priced at £699 ($799)
There is also the Mac mini server version available which is made of 4GB RAM, 2.0GHz quad core Intel i7 chip, dual 500GB 7200rpm hard drives, Intel HD graphics 3000 and is priced at £849 ($999)
By removing the optical drives from Mac mini, Apple seems to have made clear about their stand on optical drives. They seem convinced that the future for optical drives is not long and that the App store is the way forward and that is what they want to go with.