I do have some information about the Smash Four game. I do not tell the source because a job could be endanger. Forgive my English and it is not my first language.

There are some characters that I have seen that are not official reveals now.
*キャプテン・ファルコン (Captain Falcon in English)
*ディディーコング (Didi Kong in English)
*ファルコ・ランバルディ (Falcon Lombardi in English)
*ネス (Ness in English)
*ガノンドロフ (Ganondorf in English)
*アイス クライマー (Ice Climber in English)
*メタナイト (Meta Night in English)
*ミュウツー (Mewtwo in English)
*ゲーム＆ウォッチ (Game and Watch in English)
*ワリオ (Wario in English)
*ヨッシー (Yossy in English)
*パルテナ (Palutena in English) it is new
*ドリ (Jill Drozer in English) it is new
*リトルマック (Little Mac in English) it is new
*リザードン (Charizard in English) it is new
*(リドリー (Ridly in English) it is new
*クロム (Krom in English) it is new
*シュルク (Shulk in English) it is new
*ディクシーコング (Dixie Kong in English) it is new
No more do I have to share, I only get characters list. 40 characters in the game. The Princess Zelda's transformation is back also.