Verified answer

http://www.opm.gov/oca/compmemo/2007/2007-14.asp

Only for executive branch non-postal employees, according to this memo.

The Executive Order was signed some time in November, I believe . Can't give you a link since I found out internally with news from the State Office Building (am a state employee).

Yes, for Federal Employees only.

Yes he has you can stay home.

Not that i know of.