It still is a possibility to have a stage in the game without any character representation of that series the stage is from
Examples like Hanenbow or Smashville in Brawl
Back on topic though, I didn't think Prince of Sablé would even be an AT, just a trophy at most. Either way, this makes me excited for the other obscure characters I want that have a slim chance of being playable to have a bigger chance as an AT instead!
That's why I think he's [quite likely] and not [very likely] or [pretty likely].
To give you an idea, I said [pretty likely] on Ridley and there was a lot more evidences. I agree that the tease alone can't be certain, but my "want" side makes me confident anyway.
Those exceptions exists, it's just that it's a very low amount out of all stages. Not to mention the circumstances of the reveals itself, but I won't go there.
Speaking of tease, I predict it may happen tomorrow and I don't know who, but just because, let's say King K Rool.
So, a DK stage that teases him.
I wonder why he wasn't teased before, but then again, pacman wasn't.