HALO 3 new campaign... Marketplace photo attached as proof.

[Supernova82]

No Halo 4 just an expansion of Halo 3.
Halo 3 's campaign was the worst I have ever played in a Halo game. All 9 levels were boring. Not even one of the Halo 3 campaign levels stood out.
The expansion of the campaign can only improve Halo 3 in regards to campaign mode.