You heard it here first folks!
So there was a rather big backlash towards 343 and MS after the announcement that Halo 5 had no split screen mode. So I believe MS will bring back split screen, but only for those who buy a Scorpio. it wouldn't be the first (or the last) time MS has held back content from their costumer's with older platforms. And having split screen for halo 6 only on Scorpio would be a way to try and "force" the hardcore halo fans to upgrade to their new platform. They will obviously say the reason is because "the power of Scorpio allows us to do things we can't on Xbox one" but yeah, that would be a load of bull!
Ms said there won't be any exclusive games for Scorpio. But they never said there wouldn't be exclusive content and features.