I highly doubt Smash Bros would spoil an easter egg unlock in another game. When a game is not even out yet in most of the world it's usually considered polite not to spoil things. This is the Smash Bros thread not the Hyrule Warriors thread. If I was posting in a thread about that game I'd not have any reason to complain since I'd only have myself to blame.You're in a Smash Bros thread. Spoiling other games comes with the series. If you're that worried about spoilers, you shouldn't even be on GAF. What if someone, heaven forbid!, used that image as their avatar?
This isn't 4chan. It's usually rather easy to avoid spoilers for a game by just not entering a thread about said game.