[MiniNerd24]

This might have been said already but if you ask me when they posted this hint they intended for it to show us something, and you guys have made excellent guesses but I think that it may be more of an update than a clue.
My thoughts: The layout of these gates are different than last year, for example, they could be on the two long ends of the field (two per a half field) and essentially turning the field sideways and putting players along the long ends, which may or may not add space for three teams to have maybe an opening onto the field (like the Air Lok for moon rocks last year) instead of just two team players using field scoring (again with the moon rocks being scored form behind the wall). Again they probably show a gate to give us a hint, but it might just be saying "hy, we're moving the gates on the field this year."
Just my thoughts. Sorry if it soundd like I was bashing somebody's idea(s).