Pulling Mobs: TF2's Über Update, Day One

Good morning, world. Speaking of Team Fortress 2, how about some actual Team Fortress news? It's a fine day for the first details on the "most ambitious update in the history of Team Fortress 2". The first part is a free weekend (starting now, for some reason), and an initial Mafia themed update, complete with a new Payload map. But what else? Valve say:

We don't want to ruin it, but we'll give you four clues to get you guessing:

1.) It IS a "Meet the" short.
2.) It involves ONE of the two remaining classes.
3.) It's NOT the Pyro.
4.) It's the MEDIC.

So it's anyone's guess. More news on this as it happens. I guess I'd better get the RPS TF2 server online, eh? Right, let's do that.