According to the rumors the Samsung Galaxy S5 would be having a 2K screen, like 2560X1400 pixels. So if Samsung is going to announce a Smartphone with this display, probability is high, that it will be the Galaxy S5. Also according to rumors, the company is believed to unveil the device officially in MWC in Feb 2014.
Also it is believed that Samsung would dropping the plans for a finger scanner for a eye scanning model, and the sources are agreeing to it also. However it is not sure, whether the eye scanning will be in the same device that is being unveiled at MWC next year, or will it be another device going to be launched later in the year.
However if we look in History, Samsung did not unveiled either the Galaxy S3 or the Galaxy S4 in the MWC meets, as they always needed a separate launching event for their devices. So if they do so, it would be surprising. Stay tuned, and we will inform you about more leaks and rumors about the Samsung Galaxy S5.