The latest rumor in the tech blogosphere claims that Samsung could unveil the Galaxy S6 in early January at CES 2015.
http://www.notebookcheck.net/Samsung-rumored-to-unveil-the-Galaxy-S6-at-CES-2015-in-January.132453.0.html
looks like the leak is fake and also an early presentation at CES would be unuasual for Samsung