This would mean all the updates so far and all available DLC for it would be bundled together. New Vegas is believed to be receiving 4 bits of DLC.
Dead Money was the first released additional content for the large sprawling RPG from Bethesda and Obsidian Entertainment. The second lot is rumoured to be called Honest Hearts with a third and likely final fourth piece due after that.
The GOTY edition would include all otherwise it wouldn't be very GOTY-like. Amazon pegs the New Vegas compilation of 1s and 0sif you preorder right now. There are no details accompanying the list just yet. of New Vegas.