Sakura resigned herself to medical duties in #633 when she declared that her restorative abilities would be available to anyone who needed assistance. We saw only two or three shinobi healed by her jutsu previously when the Sannin parallel was in full effect yet we're lead to believe that Sakura had managed to close the wounds and injuries of all those on the battlefield. Make no mistake, the replicas are still lurking about the battlefield and the Alliance forces are continuing to battle against them. The only reason that it has not been given much screen time is has to do with Naruto, Sasuke, and the Hokages' fight against Tobi being paramount in terms of significance.
To be fair though, that handseal has shown itself twice now when Tsunade was in the process of performing some unspecified jutsu when Madara was attempting to have Susanoo strike its sword down at the Kages and when Kabuto was entering Sage Mode.
Sasuke even noted how the snake summonings appeared to be growing in size and you can even see the actions indicating some sort of physical alteration occurring to them. Sage Mode is known for enhancing the attributes of its user. For summonings, that may include their overall mass.
Hmm, good catch...Well, not I am even more confused...