Meet the Spy was released

But the Scout couldn't have been the spy. He was using the Sandman, and spies can't disguise with unlockables

"Tell me, did any of you kill a red spy on the way here?"

"No."

"Then we still have a problem"

"And a Knife"

Spys also can't attack people while disguised, and friendly fire is turned off by default. Try not to worry about the details. <_<

Also, look at the Sniper's death scene. He's wearing a new hat.