I noticed on KorgPA.com today that they have a 1 hour+ video on the PA800. Professionally done, for those who have complained lately about less the TOTL video quality. It's a tutorial and gets into minutia right away. Wished it would start with an overview. I haven't looked at the whole thing yet but is seems that it will be a great overview for someone who wants details about what the keyboard can do.
http://www.korgpa.com/pa_root/en/support/tutorials.html