All the new sounds and such are great, I liked Mai's fan actually making a "woosh" when thrown, now...
At about an hour and 8 minutes in to this first 2 hour block, you can see that a final round Double KO now leads to an extra round, where each participant has about 30% health left, with meters reset. This was mentioned earlier, but possibly the first time we've seen it in vids.
Also, King's "new" defeat scream can be heard after this round. Sounds more like a "Mary" scream than "King" if you ask me, which only makes me a bit nostalgic, lol.
Also note, that when they choose to "restart" rounds after having picking random, the restarts actually seem to give them a new stage to fight in each time! This is actually quite cool.
Oh, and @Rex Dart: You know, I'd actually hope that EX characters, in a perfect work, could come with their own Bonus Alts, really. Like giving RekKyo a Shingo head (AND VOICE!) Swap, as if he mastered the power of the Kusanagi Flames, or give EX Mr Karate a Kushnood head (and voice) swap, to almost make him like a new character.
For EX iori, if they were really bold, they'd give him an Orochi Iori stance, and modify his face within his moves, to keep him wild looking, lol.
It'd be a great way to get more mileage out of the EX's, and one more way to make them feel more valuable.