Soldier: (deletes Spring Man's assist trophy)
Scout: WHOA WHOA WHOA!!!
Soldier: What? It was obvious! Spring Man's the next fighter! Watch, he'll be confirmed any second now.
…aaaany second now.

(leaked footage pops up)

See? Confirmed! No wait, it's fake.

My guess is Min Min, I feel like her being the winner of the Party Crash Bash might have been Nintendo's way of trying to find out which character fans of ARMS would most want to see in Smash.