Sammobile posted the below screenshots on March 6th from a leaked 4.2.1 ROM for the Galaxy S3. As you can see, these showcase a couple of new "Smart" features, the same ones that will be featured on the new Samsung Galaxy S4.
I am going to create an S4 Forum. But in the meantime, and until the product has an official release date, why don't we use this area to discuss all the rumors, which must obviously be true if they are on the Internet, to satisfy our intense inner hunger for gossip. Delicious!