Let's recap the speculations we've heard so far about the eventual Galaxy S7 screen panel(s) so far. Back in April, a report emerged about Samsung overhauling its factory for an increased flexible display yield. At the time, the source tipped that it won't be only the Galaxy S6 edge+ that will use one, but also the Galaxy S7, too, with Samsung building capacity for no less than 8 million panels per month on that front. So far, so good - there will apparently be a curved-display version of the S7, which is not hard to fathom, given the existence of the S6 edge now.
Fast forward a few months, and the next report from Korean media came to speculate that the S7 will launch with two screen sizes - a 5.2" one, and a 5.7-incher, which we'd have to see to believe, as it's never happened so far. Later on came another one - that we will indeed have two versions of the phone, but they will differ as the S6 differs from the S6 edge, i.e. with the latter having a dual-edge display.
Today's rumor of the moment is that the two different screen diagonals are allegedly going to happen indeed, but they are reserved for the S7 versions with a flexible screen. Again, this is not hard to believe, given that we already have the S6 edge and S6 edge+. The kicker, however, is that the source now claims that the eventual S7 edge and S7 edge+ will be launched simultaneously.
If we fuse all these rumors together, the Galaxy S7 would arrive with several screen versions to suit every taste - one 5.2" with flat panel, one 5.2" with a curved one on the sides, and another one with flexible display that would be 5.7" in size, all announced at the same time. This would be a pretty tough proposition to believe, so we'd wait until more light is shed on the matter in the form of leaks and tips.
source: SamsungViet (translated)