For now, the world champion does play
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. g2g3  4... f8e7  5. f1g2 The preparation for the world championship match keeps giving fruits for the world champion, and in this game he manages to demonstrate one more powerful Catalan idea. 5... e8g8  6. e1g1  6... d5c4  7. b1a3  7... e7a3  8. b2a3  8... c8d7  9. a3a4 An interesting side-line according to Megabase. White quickly brings his bishop out, but in the process risks to lose his gambited pawn permanently. 9... d7c6  10. c1a3  10... f8e8  11. d1c2 [#] 11... b8d7 Technically speaking, it is Giri that produces the novelty. However, an important detail: he does this after more than twelve minutes on the clock. 12. a1c1 Carlsen eyeballs the c7-pawn. If White can win his pawn back, his advantage will be enormous. The pressure along the b- and c-files a la Benko, coupled with the nasty bishops and the nastier a-pawns would be too much for Black to cope with. 12... a7a6  13. c2c4  13... d7b6  14. c4c3 Played after a lenghty thought. 14... b6a4  15. c3b3 