User blog comment:DerpyDoodle/Some Predictions for SSB4/@comment-10388898-20140820163905

I thought Sakurai wanted to include as many veterans as possible from Brawl. Sure Snake was immediately deconfirmed, but R.O.B. and Lucas have significance in Nintendo's history, and I don't see why they would be cut. R.O.B. helped Nintendo convince toy stores that selling video game merchandise was okay despite the recent video game crash. And Lucas is only one of two notable characters from Earthbound; I honestly think they made Lucas similar to Ness because of the focus on the development of the Story Mode. Heck, it was Subspace Emissary that led to scrapping Mewtwo as a playable character.

Speaking of Mewtwo, he's not coming back. I'm almost 100% sure we won't get anymore than 5 representatives from the big franchises like Mario, Zelda, and Pokemon. With that in mind, Jigglypuff takes priority because she's part of the original 12 and, like Mewtwo, she also got some revisions in Pokemon's 6th gen, too. With her new sub fairy-type, she would be far more unique than Mewtwo who would end up with a Final Smash of another Mega Evolution (which we don't need).