Typically, the government won't install Windows 8 until the first service pack or incremental update (whichever Microsoft chooses to go with) because of all the testing that needs to be done to insure compatibility with existing software of the non-Microsoft variety. The announcement that came out to government employees did say Windows 8, Office 2013, and Share Point 2013 to name a few.
As for training to make the switch, there are folks in every organization that are technology challenged and will need help adapting to the new interface. It's not as simple as switch to desktop mode as some here have suggested. They'll be asking where the start orb or button went, why they cannot find the menu of programs, what the heck happened to this or that and so on. So there will need to be training accomplished for the differences between Windows 7 and Windows 8 when it comes to what capabilities are available and how to access particular software/hardware settings. Unless Microsoft cut a deal to return the desktop to normal for enterprise licenses, which I doubt.