(Update: Gameplay Live now at the Nintendo Treehouse) New Nintendo IP: Code Name: S.T.E.A.M. revealed for the 3DS! Coming 2015!

[noname2200]

benao87 said:
Was this the secret game they announced yesterday?

It was announced before that, but yes.

episteme said:
Will they show it at the Treehouse event tomorrow? Imagine they'd show it with SMT x FE, omg.

Yes.