If DSi XL is coming out in this quarter as they say it is, then have to give it a hype push. That should be the major thing.
Beyond that, they'll probably give some release dates and let the press play a couple key games for Wii/DS/Digital stuff.
Wii:
Galaxy 2/Metroid release dates. Probably playable.
Monster Hunter 3 playable
Sin & Punishment 2, and maybe a few others will show up too.
Probably some hype for stuff like NBA Jam, Epic Mickey and Red Steel 2.
DS:
DSi XL centered mostly
Pokemon HG / SS
Golden Sun, maybe a couple third party games.
VC/DSiWare/WW:
Sonic the Hedgehog 4
Max & The Magic Marker
Could see a couple third party games announced for WW/DSiWare/DS/Wii too. Personally, I'd like to see what DS would do with a price drop in the USA, but there is no reason for it yet since PSP is more expensive and performing much worse in comparison.
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