“This version has been released with Android N(7.0) compatibility,” reads the change history for Samsung MultiWindow SDK 1.3.1. Now we know that the next major update is Android N because that's what Google is calling it right now but the company hasn't confirmed the version number yet. It wouldn't be surprising if Android N (or whatever dessert name it ends up getting) is 7.0 because even though Marshmallow wasn't a particularly evolutionary update the version number was bumped up to 6.0.
Android N brings several new features, such as the ability to reply to messages from the notifications bar, a new notifications panel, improved Doze mode, changes to the user interface as well as a Multi-Window mode that has existed on Samsung handsets for a very long time, so it does warrant a newer version number. 7.0 would fit the bill perfectly.
