According to a producer at Polytron, there's still one secret the community has yet to uncover. Maybe the small resurgence of Fez that came with the recent Playstation release will push the gaming community to uncover this secret (fez is the gift that keeps on giving). Maybe uncovering it will lead to something insane like a Fez 2 re-announcement (not counting the one phil did on April Fools Day). Maybe it will reveal Phil Fish is Andy Kaufman in disguise. Only metatron knows.
Some other stuff she talked about: There is no new content added to the playstation versions of the game besides 3d tv and lightbar support for ps4 (and some other changes to fit the platform). So no added secrets/puzzles. The lightbar matches the color of the sky in whatever level you're in, and the 3dtv support has to be unlocked like stereoscopy was in the other releases (it's just better 3d this time around)
Just beat fez on vita (beat it on PC originally). All I know is Im not inputting that code to break the heart cubes until I know the secret has nothing to do with that. I have a feeling it does. Here's why
"Ok. So there's two things that you [the community] found, assets that you know that exist, but you don't know the reason why. Especially one that was found in the code. Ok now I'm done talking! ;)"
Im certain it has to be the heart cubes, as what she is describing sounds like them (we know about them and they were brute forced through decompiling)