I kind of really doubt anybody saw SMT X FE coming. There weren't really any indications.
BECAUSE of that, I really doubt Nintendo has exhausted their "surprises" for e3. I think they still have completely new things to show, as well as lots of things that will keep people excited during e3.
Announcing some of the things now was a good idea, I say, so more people would be willing to watch what Nintendo has in store rather than just ignoring them because of the PS4/720.