District of Columbia v. Heller

Facts:
1.  Stevens wrote a dissent against the case
2.  The five conservative judges voted against gun control.
3.  The conservative judges thought it violated the second amendment. 
4.  Stevens believed that the founding fathers would of made it clear if the second amendment referred to individuals
5.  Justices David Souter, Ruth Bader Ginsberg, and Stephen Breyer also were the dissenting judges.
6. The Judges who won the case were Scalia, John G. Roberts Jr. Anthony M. Kennedy, Clarence Thomas, and Samuel A. Alito Jr.

Questions:
1.  Isn't the Bill of Rights meant for citizens and not government branches?
2.  Are you allowed to carry a gun in the District of Columbia?
3.  Due to the outcome of this case will the issue ever be brought up to the Supreme Court again?
4.  Does this case apply to the states as well?