I would expect one. Iwata is going to need to answer to investors about what the company is doing to turn things around, so they might as well reveal things in a fun way to fans just before that. That's why they did it last year at this time, and this year is almost more dire because losing money during Wii U launch was acceptable... this year is not.
I expect an ND probably this week where they will talk about release plans for the year, and possibly reveal a game or two, or other initiative to drive their business. What could be shown? I think some concrete X details (name, release, game style, online multiplayer). Mario Kart release date. Smash release window. More 3rd party partnerships. Something for the casual fan. And maybe a Zelda tease, such as a brief glimpse or concept art showing it won't be toon link... they are desperate for good press right now.
