Whos with Blair?

The next season of gossip girl starts of in Long Island, and many photos are being seen on gossip sights. Recently a photo of Blair Waldorf (played by Leighton Meester) and a mysterious new guy are seen bike riding. The mysterious other is supposedly named Marcus (played by Patrick Heusinger). In the books Blair goes out with a guy named Lord Marcus. Could this be the Lord Marcus, Blair goes to England with?

But what does this mean for Chuck (played by Ed Westwick) and Blair? A new photo shows Blair and Chuck in quite an intimate position and staring into each others eyes quite intensely if I do say so myself. So does this mean Blair is with Chuck or Marcus or neither? What do you think? Tell us your new theories by commenting. Please and thank you! :]