Blizzard is making mods for Starcraft II. Does that still make them mods? I don't think so, I think it just makes them updates, but hey, if mods are what Blizzard wants to call them, then mods it is.
Lead designer Dustin Browder tells Game Informer "We've got some mods we've developed internally that we're going to put out to get some more art into the hands of the mod makers but also provide what we hope are some polished gameplay experiences for our fans to get more value out of Battle.net."
Patches? Add-ons? Expansions? Ah, who cares what they're called, so long as they're great, and so long as they're free.