This being a promo video, everything of course sounds peachy, and only changes that give players more power/options are mentioned.
That said, if they haven't veered off from the latest Unearthed Arcana version (which managed to excite me! see here), this should be a fantastic improvement all around.
Except Stealth mechanics. (They're not mentioned in the video, I'm only judging from UA.). I swear there's a dark curse on D&D and we just can't have good, elegant, and intuitive stealth mechanics in this game.
And here's some art from the video, featuring Rogue, Assassin, Thief, Arcane Trickster and Soulknife.
rogues are SO COOL you guys, I'll NEVER get over them