I found the proper name of the kata the move at 2:18 comes from. Okinawan styles (shito-ryu, shorin-ryu, goju-ryu, wado-ryu, etc.) call it pinan yondan while shotokan calls it heian yondan. For some reason we called this kata "kata roku-dan" in my dojo.
Below is the link the the kata, the move in question is performed at 0:22.
http://www.youtube.com/watch?v=KmLQq_q_YMg
And for the record, karate has plenty of techniques that look "exotic" (karate did evolve from chinese martial arts after all). They don't see much use in free sparring (some of these techniques are dangerous, meant to cause real harm rather than score a point) and they're even more infrequently portrayed in movies/tv and games, but they're there. XD
I strongly agree with @Zeo: "making and playing a game are different". Sport trainers are a example: they used to develop athletes but not to win competition by themselves.
The move at 2:18 was definitely new. Looks similar to a part of a karate kata (don't know the traditional name, we called it something else in my dojo). It's a simultaneous age uke (ascending block) with the left hand and a shuto uchi (knife hand bash) with the right hand, followed by a mae geri (front kick) finishing with an otoshi hura ken uchi (descending back hand bash, though in the video Hitomi did a regular back hand to the face). It'd be interesting if the first part (the simultaneous block/knife hand) was a sabaki.
To be fair, making and playing a game are different. I'm sure there are plenty of people that have plenty of knowledge in the science of something but don't perform well in the actual field they have knowledge in that actual field. Spending months developing a game does not make you good at it.
GAKU on the other hand... he's in charge of game balance... he should... be a bit better at the actual game.
"...and Shimbori, the director of DOA5U who knows the game in and out."
I mean no disrespect, truly, but to say they know the game in and out but then fail to capitalize on certain things seems to be a bit of a fabrication.