The news means Wii Sports is no longer the all-time best selling video game. Although that's probably not a fair comparison as Wii Sports was a pack-in game for the Wii:
Take-Two says GTA V is now the "all-time best-selling video game" ever in the US, based on revenue and units sold, across digital and physical platforms. The game has now surpassed Wii Sports, which sold 82.83 million units worldwide. Notably, Wii Sports was a pack-in game for the Wii, while GTA V is and has been sold on its own.