The new 3D Mario would be the only new reveal here. Surely that wouldn't be the case. Though with Nintendo wanting to prioritize using Directs I suppose that could be the releases for 2013 and they'll use a Direct to show us the stuff from the first half of 2014. But then you figure we get at least one more Wii U title in 2013, and they're only including one silhouette for a 3DS game.
I don't care if this is it for 2013 for the Wii U, Nintendo should show as much as they can just to give the impression that the Wii U has a healthy future. Like I don't give a **** if some game they show isn't due for two years, it's important for the Wii U's image that there be something concrete to look forward to. Although I have nothing to go by other than my typical cynicism regarding Nintendo, I just assume they don't get that. They'll show what's due in the next few months and figure everything else is too far off to be a concern and then wonder why Wii U sales don't pick up. Nintendo can't sell what the Wii U currently IS, because it ain't much. They have to sell what the Wii U will become, and that means they need to generate hype on future projects.
Of course Nintendo isn't going to have a silhouette on this site of something we wouldn't have any way to recognize so the absense of other silhouettes doesn't mean an absense of other reveals.