Maybe this was already posted and I missed it.

http://www.youtube.com/watch?v=npniZ6iwo30

Looking at the B787, It is very noticeable the flex of the wings and
changes of dihedral. Would this be less apparent in level flight?

What would be the effects of this changes for pitch and/or roll if
this happens while landing (low & slow).

Your thoughts will be appreciated.

Alfonso

They all flex. If you look out the window in a 747 during turbulence it will scare the hell out of you :)

Apparently this is not noticed by the pilot but I am no airline pilot by a long shot :)

Flex up and down is OK but twist that increases the angle of attack at the tip is a no no for flutter reasons.

Paul Lamar