The Civ 5 Mac "Campaign Edition" was made specifically for the Apple Mac App Store. The other versions (e.g. Steam version) is never referred to as a Campaign Edition.
The OP was simply announcing that the long-delayed update for the Mac App Store version is finally released. The Steam version, as everyone already knows, gets updated much earlier.
I'm sure this recent App Store update has similar "bug fixes" as the one on Steam, or at least that is what they should have accomplished. The one big disparity is that the Mac App Store version will never have the same robust multi-player features as the Steam version. Anyone who is a veteran Mac gamer (and has several Aspyr/Feral titles) should have already expected that.