Windows 8 comes with a couple of new or tweaked commands that may actually be pretty handy if you use the Command Prompt to do things faster on your computer or a bunch of PCs.
Tim Fisher on About.com's PC Support site details the commands that are new, removed, and altered in Windows 8. A few highlights:
Fondue The fondue command is no doubt one of the more memorable new commands in Windows 8. It stands for Features on Demand User Experience Tool and it's used to install any of the several optional Windows 8 features directly from the command line.
Licensingdiag The licensingdiag command is actually a pretty handy tool. You define an XML and a CAB file to create and Windows 8 will generate both, full of information about your Windows 8 installation, specifically product activation and registration related data.
New switches for the shutdown command are also useful to know, especially if you want to create a shutdown tile on Windows 8's start screen:
The shutdown command features two new switches over shutdown in Windows 7.
The first, /o, can be used with /r (shutdown and restart) to end the current Windows session and display the Advanced Startup Options menu. This change makes sense due to the fact that, unlike in older versions of Windows, the diagnostic features in Windows 8 are accessible without first restarting the computer.
The second new switch, /hybrid, performs a shutdown and then prepares the computer for Fast Startup, a feature introduced in Windows 8.
Fisher has also compiled perhaps the most comprehensive and up-to-date list of all commands available across every version of Windows, which is pretty impressive.
New (and Removed) Commands in Windows 8 [About.com PC Support]