The teasers include one promoting the privacy of the Galaxy S7 and Galaxy S7 edge. Another teases the IP67 certification that will allow you to submerge both devices to as deep as 3.2-feet for as long as 30 minutes. And the last one teases the rear-camera's ability on both models, to take pictures in low-light conditions.
Besides the IP certification making a comeback after being removed after one year as a feature on the Samsung Galaxy S5, a microSD slot will once again be available on both phones. And we should see larger capacity batteries inside the pair; a 3000mAh battery will be found inside the Galaxy S7, and a 3600mAh juicer will be powering the Galaxy S7 edge.
The Samsung Galaxy S7 and Samsung Galaxy S7 edge will be unveiled on February 21st, the day before MWC opens, during the Samsung Unpacked event.
source: Samsung (1), (2) via Gizmodo