Video != reality
Concepts shown in that video do not represent any sort of reality.
1) Ultra Thin Design...highly unlikely:
You have to have a place for the battery, so a phone as thin as it is in the video is out (unless Apple finds a way for an iPhone to run on CR-22s)
2) Laser Keyboard...not probable:
Laser keyboards have to be projected from above to work. Unless you want to have a bulky extension to your iPhone, it's not likely it will happen.
3) Holographic display...not even feasible
A holographic display looks like it would be fun, but then again, it's not feasible...a projector needs something physical to bounce light off of, else it will not show up. Current holographic displays are produced by the display bouncing off of a series of mirrors so that it appears to be displayed in midair. Such is not the case on an iPhone, even if it were to bounce off of internal mirrors. The only projected video you would see in midair would be...nothing.
