A four-way tie for first was possible entering the last round. If Hikaru Nakamura could bounce back from OJ-gate (Nod-gate?) to defeat Magnus Carlsen, and Levon Aronian could take down Vassily Ivanchuk, then those four would all tie for first and go on to a blitz tiebreak. That would have been entertaining, but both games were drawn (pretty easily in both cases - Carlsen with Black, Ivanchuk with White), resulting in a two-man playoff between Carlsen and Ivanchuk.
Once the round finished (Viswanathan Anand's win over Francisco Vallejo was the last game to conclude, putting Anand in a tie with Nakamura and Aronian for third) they went on to a blitz playoff. Carlsen had White in the first game and initially had Ivanchuk on the ropes, but it wound up a draw. That was a hopeful moment for Ivanchuk's fans, especially after two pretty convincing losses to Carlsen in the slow games, but he couldn't build on it. Carlsen broke through on the kingside in the second game, and became the official tournament winner. A pity for Ivanchuk, after his great start in the tournament, but a great job of bouncing back from Carlsen after a slow start and the blown game with Vallejo from the first cycle.
Final Standings (3-1-0 scoring, with traditional scores given in parentheses):
1-2. Carlsen, Ivanchuk 15 (6 for Carlsen, 5.5 for Ivanchuk); Carlsen wins the playoff 1.5-.5
3-5. Nakamura, Aronian, Anand 12 (5)
6. Vallejo 10 (3.5)