Especially for a very light aircraft. Might just have been the camera angle but to me it looked like the wings were really curved, almost as if they were a bit too flexible.
Nope that is quite intentional to have the wings flex upward like that. In fact all the new Boeings coming out will have an amount of flex that when under full load will rise significantly above the top of the fuselage.
Just wait for the flight of the 747-8 when it comes to upward sweep.
FYI, high upward wing sweep has been used before with great success and superior efficiency!
