This looks like fucking shit. What a shame, and here I was being naive that we would get a nice story-driven add-on that fleshes out the world and characters a bit... nope, let's just make a few maps and shove some old enemies in there. $15-20 for an hour of old content, please bend over.
Pro gamer tip from me: if any DLC has the words "arena", "challenge", or "mode" in its title, stay the fuck away and kill yourself.
Could you even be more butthurt? Its optional DLC that's only $5.