The teaser image suggests that a redesign of the TouchWiz UI could be expected.
The right half of the image is occupied by a grid of nine icons.
Each of these icons carries the number 5, perhaps an indicator of the smartphone that will be presented at the event.
Appearing more round and flat, these 9 icons stand for the concepts of speed, outdoors, curiosity, fun, social, style, privacy, fitness and life.
Samsung is expected to unveil a new Galaxy Gear smartwatch at MWC 2013.
Earlier this week two models of Samsung Galaxy S5 were unveiled by an AnTuTu benchmark.
The event will take place on February 24th in Barcelona, Spain, at 8:00 p.m. CET.