Found this link (http://www.ign.com/articles/2013/09/18/uncharted-p
s4-listed-by-gamestop) on IGN saying U4 may have been leaked. What do you guys think?
I don't know, could be, last e3 the same thing happened with Mirror's Edge reboot, just before e3 there were some rumors (the same as you just posted) and during e3 it was confirmed, but I don't know, it's wrong a lot of the time also, and I don't think we will hear any news about it soon, probably during the video game awards (december 2013)
Love Uncharted but can't get too excited until we get some more solid details. This doesn't tell us anything we don't already know because ther's almost certainly going to be another Uncharted. It will be cool to see Drake on the next gen machines though.