From the Perrin Kaplan interview at
IGN, when asked about the 2004 lineup, she replies with "We are in the next week or so going to come out with what our software lineup is."
I am sure they will be showing
new games. Hopefully some totally new games, Mario Tennis (finally), and.. other surprises. Other sources also claim Nintendo will show off new games in the very near future. Another interesting thing to note is that Nintendo are having conferences in Japan from 15-19 of January, which is a conveniant time to show off new games.
If they aren't coming out with new games, then all they would show is Pikmin 2, Pokemon Colloseum, 4 Swords... and... not much else. Nintendo are bound to show new games that we haven't seen before.
I wouldn't have started a whole new thread just for this, but there wasn't really a thread i could post this in.