To answer your questions:
1) The controls for fatalities (and anything else for that matter.) are just like those of the PS2 & Xbox. For controls, find the instruction manual. Look for a strategy guide on Neoseeker or GameFAQs if you need to find Fatality combos or anything else.
2) No, none of the endings are storyboards. All are martial arts videos.

If you know a mediator, ask him/her to close this thread, because I just answered your questions.

You mean moderator; mediator is a go-between for two or more groups to have them come to a collective agreement.
Anyway, questions answered.