If you folks haven't heard yet, the descriptions change on the new items if you read them while equipped with the Eliminating the Impossible set, and put together read:
"Think of the deeds of hellish cruelty, the hidden wickedness which may go on, year in, year out, in such places, and none the wiser."
(Sherlock Holmes quote)
I've heard references drawn between the items and Abraham Lincoln implying something Pyro-related but I don't remember them off the top of my head (there was something blatant on the capacitor iirc spelling out "ABE", the others idk).
EDIT: Just clicked Gamecubic's link. :derp:
EDITEDIT: Forgot to mention that nav files for 2Fort, Gravelpit, and Dustbowl were updated too, but the nav files don't apply to tf_bot. Which means a new AI-related aspect on the horizon.