As Samsung already announced, it's holding a major press event in New York on August 13. From what we gather so far, the keynote will be focused on the Galaxy Note 5 and the Galaxy S6 edge+ phablets, but this new teaser suggests there may be a third device, even larger at that. The lone image, joined by a countdown timer to the event, depicts the three devices stacked on top of each other, but it's about as vague as it gets. Mysteriously lit, the Galaxy S6 edge+ is on top, its curved edge gently accented. The Galaxy Note 5 is underneath, only it's facing down, so you can see the curve on its back, similar to the one of face of the S6 edge+. The S-Pen has been popped-out, with the groove in its top end highlighted, further fueling our suspicions that a novel means of ejection has been implemented. And then there's the third device - a substantially larger one, firmly in tablet territory. Given that the theme of the teaser is "BIG", it could be the recently announced Galaxy Tab S2 in its 8-inch incarnation, but the strips in the bottom part of the frame weren't present in the official images, so this one will remain a puzzle, if only for another...
Source: http://www.gsmarena.com/samsung_galaxy_unpacked_2015_teaser_reveals_s6_edge_silhouette-news-13413.php