That's because according to the SamMobile blog, the Galaxy S3 will soon receive Samsung's as part of a coming 4.1.2 update.
In addition to Multi-View, which lets the user run and view two applications at the same time, the update allegedly includes a customizable notification panel, a new gallery app, the continuous input keyboard, and Smart Rotation (where display adjusts to angle of view).
It's unclear how far along Samsung is at this stage, though the company may be testing a JZO54K firmware build. Rumors currently put the 4.1.2 update on the calendar for some point in late December.
With that said, SamMobile is providing links and brief instructions on how to install the test build on your Galaxy S3. Just remember, kids,and modifying a device is .