it's not a question of spoilering surprises, but if they'll talk about w101 and pikmin and luigi, they'll talk for sure also about fit and party. and if the direct will discuss also 3ds games, considering mario, smash and kart and the summer OS update...do you really think that one hour will be enough to show also X, bayonetta, yoshi, fire emblem and maybe also a couple of new games including retro's new title?
I don't think so...
Easily. You're projecting too much time for each of these things. Watching the last six or seven e3's recently, they rarely spend more than 90 seconds on any game - and that includes stuff like Metroid Prime and Super Mario Galaxy.
I mean, even if you look at E3 2010, where Nintendo lost their minds and announced everything. They spent 30 minutes demoing two games, had 10 minutes devoted to stuff like Wii Party, Just Dance and Mario Sports Mix, had the typical rhetoric and filler while announcing and revealing new hardware - which they went into 10 minutes of detailed description, developer diaries and attached publisher lists for... and still found time to announce everything they did in the other twenty minutes. 2 minute long Donkey Kong trailer here, 90 second Kirby trailer here...