GDC is going to be big for Nintendo. Not because they are going to announce killer apps, but because they'll have a chance to give developers something else to get excited about.
As reported on the NWR (I almost put PGC lol) homepage the online dev kits have been in the hands of developers for awhile, if they're smart they'll urge devs to release online games soon (and very soon) after the release of Pokemon Battle Revolution which better hit before July.
Nintendo also needs to give the developers some new incentives and "party" hats. IGN interviewed the Factor 5 dude, and he said he would love to create something for the Wii. The problem is that he isn't doing it now, he offered a lot of critiques for the companies who are making software, but isn't making his own. Why? Well he says because Sony is pretty much doing whatever he asks so they have a good relationship, this is what Nintendo needs (blind loyalty) to develop with (no pun intended) developers.
The original Wii Ware content also has a chance to be big, but again Nintendo needs to prove that there is good reason for developers to make such content. They have a habit of doing that by coming out with their software first, and saying follow suit, maybe a little more hands-on help would be better.
Developers are video game fans like us, except they actually have the power and resources to make games. However, as I mentioned they need something to get excited about. There are a lot of possibilities with the Wii, but everyone is afraid of taking risks for a couple of reasons.
1. Nintendo fans buy Nintendo software over anything else. I mentioned before (somewhere, maybe this thread?) about how there are no clones of the popular Nintendo franchises on Nintendo consoles. I would like to see a fresh 3D platformer, I mean Hell Yes I'm excited about Super Mario Galaxy's but I'd like to see something else done well by someone else. I would also enjoy a Capcom, SEGA, or even EA version of SSB.
2. Kidie image, and Non-gamers. Manhunt 2 is going to scream in the ears of industry. Can a "mature" (or Adults Only in this case) game sell well on a Nintendo console? If Manhunt 2 fails for any reason other than it sucking (which I doubt) every other developer is going to take their violent games and go elsewhere. The Kidie image may be shedding slightly, but Nintendo itself is pushing the non-gamer aspects of the Wii, and while not a bad thing for them, it could potential be for us, and developers of non-non-games.
I'm speaking tongue-in-cheek, playing devil's advocate or however you want to call it, but these are serious issues for developers regardless of that.