Didn't they reveal TES6 will be in Hammerfell? Either Hammerfell's ongoing war against them will feature prominently in that or it'll be set after Hammerfell got a truce out of them.

Although that runs into an issue that what happens in Skyrim would still be immediately relevant: if the Stormcloaks win then Skyrim is allied with and supporting Hammerfell in its war, while if the Empire wins Hammerfell is almost completely alone. Unless they just "lmao dragonbreak!" Skyrim away, which is what they're almost certainly going to do now that I think of it. It'll just be "huh seems like all those dragons did a heckin dragonbreak or something and it seems nothing conclusive happened there!" because Bethesda doesn't have any decent writers left.