[saagarjha]

This is an internal code name for something that has not been publicly released.

[kkarakk]

remember windows metro? marzipan is going the same route, whatever apple calls it later, marzipan is going to stick

[toasterlovin]

Marzipan is not something that is public facing. It is an API for software developers. It will get a name at WWDC in a few weeks and then it will have about as much public awareness at UIKit.