As can be seen in
this picture of the second prototype, Boeing is now using aileron droop in the high lift configuration (meaning the ailerons are slightly deflected down to support the flaps in delivering the lift needed for take of and landing). This is how it is done for Airbus from A319 to A380, this is how everybody expected the 787 to be designed. Load alevation in the high lift configuration by deflecting both ailerons up as some posters assumed would not make any sense.
So finally we have learned, that the unusual upward deflection of the ailerons during first flight was an additional safety measure to have more margins for any unforseen events and is not a standard 787 design feature. The structure obviously is also capable of taking the bending moment in the high lift configuration with aileron droop. (and Boeing is confident in this by now)
case closed.