RPS can confirm that friendly fire will indeed be removed from Team Fortress 2 in the update rolling out in a couple of hours.
Lead developer Robin Walker told us that he did indeed email German forum Gamestar to say that the mode was never meant to be left in.
"We shipped it by mistake, as it wasn't something we wanted to be a part of the game. We haven't built the game around having it in, and it just stops it from working," explains Walker. Breaking both the Spy and the Pyro, the TF2 team decided that friendly fire prevented the game from being any fun to play, and it will soon be gone completely.