Curiously, the topics vary by region. Nintendo appears to have no plans for a Japanese broadcast, though the lack of an announcement could simply be due to the fact that it's past midnight in Kyoto. (It is not unprecedented for Nintendo to announce and stream a Direct within a span of hours. Perhaps they will announce in the morning?) Nintendo of America says it will be discussing upcoming 3DS and Wii U games. Nintendo of Europe, however, will only be discussing 3DS games.
In the meantime, tell us what you're expecting to see, and what you hope you'll see - sometimes two very different things when it comes to Nintendo. And stay tuned to IGN - we'll bring you all the latest news, plus our thoughts on what Nintendo reveals, tomorrow morning.