GTO in 92? Don't believe there was such a thing.
And the GTO is taking a year off for remodeling, then it is coming back with the LS3 in '08. Its not being replaced...yet.
And there is no bird in the works yet. GM can't afford to bring back 2 models that are pretty much the same. If the camaro is a huge hit, GM may consider the firebird, or Pontiac twin, but HIGHLY unlikely.