Armor FX can be cool (not new) but I had enough trouble seeing customizations in the flight with the outline system. Hope that gets reworked; I know it's been a hot topic since the testing.
Didn't know about vault sliding! The MP here is so nice, movement looks to have a lot of the same speed as 5 but with a larger skill gap.
Also, Frosty (IIRC) is one of the few that didn't love the flight. Has anyone seen a clip that provides some of his thoughts/impressions? If not, perhaps latter I'll dig through his twitch vids to find some - genuinely curious what he wouldn't like