If the above screenshot is real, then it looks like Samsung is exploring a completely new and revamped UI for TouchWiz. This new overlay includes elements from Android, iOS, & WP. At this point we don't have any intel on this new UI other than what can be gleaned from the pic. It's possible this is simply a new UI design concept proposal, although it wouldn't be surprising to see it show up in some new Galaxy product later this year. Of course, it could also be a fake, so we will watch out for any indication of that.
It shouldn't be too surprising if it is the real deal. Samsung's Touchwiz is getting long in the tooth and could stand for a decent upgrade. Let us know what you think of this concept in the thread.
Source: @evleaks