I think that 3DS has a chance of becoming the portable console of choice this Christmas. Its new price isn`t that high above DS and with Mario 3d Land, Kid Icarus, Starfox and with Mario Kart 7, 3DS will appeal to just about anyone. Of course some older and newer titles will help sell the console.
The Wii is another issue... i think this year Nintendo will have to carefully choose bundles to attract gamers and casuals. The only big titles coming for it are Zelda and Just Dance 3, not forgetting about Kirby, Rayman Origins, Go Vacation and Nintendo Select titles that could also help sell the console.
Last year Nintendo had bundles for Mario Kart Wii, NSMB Wii and Wii Fit. This year i am expecting at least a dedicated Just Dance 3 bundle.
Besides this one, Nintendo could offer a Wii + Wii Fit for a lower price and bundles for Zelda, Kirby and Nintendo Select titles aswell.
Nintendo did say that more bundles will be announced, so... anything is possible!
More than anything, Nintendo has to really appeal to casual gamers to make it big this Christmas.