Well it isn't much, but it appears Gamerzines managed to get their mitts on images of what looks to be the main menu of Splinter Cell 6 - and yes, it looks like Sam Fisher is still in the game.
The image, published by audio tools manufacturer Blue Sky, shows Sam Fisher with his signature goggles. He's also in the same pistol power pose that was prominent in Splinter Cell: Conviction.
"SC6" can also be seen quite clearly in the pic.
Splinter Cell 6 was previously confirmed to be under development over at Ubisoft Toronto and under the command of Assassin's Creed producer Jade Raymond.