By McLaren's high standards the team have struggled over the last couple of seasons, this has also been a transitional year owing to their change to the Honda powerunit for 2015, whilst serious personnel changes have also been made. One of the major coup's for McLaren was extracting Peter Prodromou from Red Bull, as he'll now head the aero department. Small interim changes to the car since his arrival have had all the hallmarks of his handy work, but in Abu Dhabi we see that the '29' has been treated to several Red Bull-esque alterations.
The wing's predecessor clearly shows that their is an ethos to which Peter and his new team are trying to achieve, in terms how the wing is constructed. We know that the flexi-wings of the past created a definite performance advantage and teams can't simply forget this, granted the deflection tests are now much more stringent but this won't prevent the teams from trying to circumnavigate them.