I doubt it's Spirit Track. I'm also skeptical it's Zelda Wii since they wouldn't release two at the same time.

Wii Fit Plus works. Pikmin maybe?

What if something came bundled with WM+.... I've seen the Animal Crossing box with Wii Speak, it takes up about 3 games for itself. Something with WM+ probably takes a similar amount of space

Doesn't sound likely, though. We're already getting Wii Sports Resort with WM+ in July.

Shelf space allocation is predetermined regardless of box size. All the big publishers request X amount of shelf space so this doesn't mean the box is bulky.

An upgrade?  With Wii Fit selling so well right now?  Sounds like BS to me.  I could maybe see a sequel, but an upgrade would just piss off all the people who bought Wii Fit.

Hence why I didn't list it among my suggestions.

I really don't see it being an upgrade or a sequel to Wii Fit. There's a reason NSMB2 hasn't shown up yet - The original is still selling so well. And Wii Fit is selling even better. Can't imagine Nintendo trying to handicap the sales of it's own titles like that.

I know you didn't, but plenty of others are.

It is a rumoured sequel, not upgrade. All we know is that 'Wii Fit Plus' and 'Wii Fit Plus with Balance Board' were seen on a listing that had the right release month for Wii Sports Resort. It's not definate but I'd assume that it was just a sequel if it were coming out this year.

EDIT: Also the fact that you can buy it as a stand along game kinda gives away the fact that it would only be a sequel and you could play it with the balance board you have.

I also agree it's too early to be releasing Wii Fit+.

The original game is the best selling game this year so far. At least they should wait until the game starts slowing down, but hey, they also released Big Brain Academy and Brain Age and the sequel close to each other on the DS.