Mad (Flt) Scientist:
Yes it is definately a roll to the right. The Super Hornet is said to be statically neutral to slightly unstable longitudinally. In the picture although the stabs are deflected differentially to the left, they are also at a net trailing edge down position.
If the roll was to the right, it's possible that the stab position is in some way related to relieving v-tail loads or improving rudder effect; but that seems a thinner explanation.
This sounds quite plausible
Intruder & machbias:
The effect is more than a transient, it lasts as long as the high AOA roll does. The flight control system continues to make small adjustments to the stabs while the aircraft performs the manoeuvre. The adjustments made however are usually to both stabs symmetrically, i.e the angular difference between the stabs remains constant. The adjustments are basically in the pitch axis.
This condition always exists when the Super Hornet executes a high AOA roll, also as part of the roll damping logic when the pilot neutralises lateral control, the deflections of the control surfaces are reversed to they appear as a mirror images of the picture posted.
TruBlu351:
Yes you are correct. Many aircraft exhibit the trait of fluttering surfaces to maintain precise attitude. Most of the time its relatively easy to understand what the FCS is trying to achieve, as the control surfaces are deflected traditionally to deal with flightpath and attitude excursions. The control surface repositioning also usually coincides neatly with these excurions. In this case however its not so clear.
Obi