A possible purpose for 3D!

http://www.eurogamer.net/articles/2014-03-03-fez-finally-comes-to-ps4-ps3-and-vita-in-march

Regarding PS4 functionality:

"The DualShock 4′s lightbar has been put to the task of bringing a little bit of Fez's world inside your own home, and you may not need to look everywhere for that dusty pair of red/cyan glasses to get access to a very late-game easter egg."

So there IS an easter egg!!!