Agree with this post, we are seeing the top clubs expecting more and more from their central defenders on the ball. Mascherano is an excellent example at Barcelona, even at United we have seen Smalling/Jones played at full back this season giving them more chance to get forward with the ball. We have already seen benefits with them passing the ball out of defence and bringing the ball into midfield themselves, Evans has always been pretty good on the ball and he's stepped it up again this season.
Other such examples have been Chelsea sticking with David Luiz throughout some terrible form mainly because of his ability on the ball, Piqué at Barcelona, Varane at Real and obviously Martinez at Bilbao. It is only going to make for better football as we see defenders be more and more accomplished with the ball at their feet.