I really hope Valve is trolling. Unless they really do release a new game mode or new buildables or something else massive, I don't see how they can back up their claim that this is the biggest, most ambitious update so far. Some new weapons, simple and straight forward (albeit cool) weapons for most of the classes, and Meet the Medic is hardly game-changing.
Also, I assume there are missing stats for the Detonator, otherwise it's literally just a reskinned Flaregun with an Alt-Fire function, i.e. a complete upgrade. I can't tell if it's changed from the Beta one or not.
I don't want to be one of those people who whine about free updates. I'm stoked that Valve is actually releasing some new weapons that aren't gimmicky, ugly, community-made junkpiles I'll never use. It's just that, not only is this the first real update to the game since I got a computer that actually can run TF2 properly (Replay Update doesn't count to me), but Medic is my favorite class and Valve hyped the hell out of it with all the doves and the Saxxys and calling it the "Uber Update".
Uber means Super, damnit, don't just chuck us some new shotguns and boots.