I expect Wii to outsell PS3 in the Americas and Others. As to Japan, it looks as though that may not happen, or this is going to be a close race, at least not until new bundles are offerred.
All this is based on looking at various points in time at this week's Amazon sales charts in various countries, admittedly not a very reliable source.
Currently Playing: Shin Megami Tensei: Devil Survivor Overclocked, Professor Layton and the Curious Village
Anticipating: Xenoblade, The Last Story, Mario Kart 7, Rayman Origins, Zelda SS, Crush3D, Tales of the Abyss 3DS, MGS:Snake Eater 3DS, RE:Revelations, Time Travellers, Professor Layton vs. Ace Attorney, Luigi's Mansion 2, MH TriG, DQ Monsters, Heroes of Ruin