Itachi transferred another power to Sasuke...
I myself think that his is very unlikely, but it's worth mentioning
When Itachi poked Sasuke's head twice before he died last time he transferred his MS powers to Sasuke (as we all know)
However this time in his 2nd death if you'd like to call it he placed his forehead against Sasuke's which is really a motion to show how much he wanted to convey his feelings to Sasuke, but what if he transferred the Yakata Mirror & Totsuka Blade to Sasuke (which could be used to seal Madara)
Again, read the first line of this post, still worth a mention.