Make up your minds
First, EA says they expected the US market for GameCube games to grow by 15 to 20 percent, instead of 20 to 25 percent, causing Nintendo's share price to drop over 6% (article in German), and they were reconsidering porting their sports titles to the GameCube.
Now, they say they're announcing they will be collaborating on "games that will include exclusive features for connected play between the Nintendo GameCube console and the portable Game Boy Advance system. The creative effort will be led by EA, with Nintendo's legendary game producer, Shigeru Miyamoto, providing input on technical game play elements." And the first three games are all sports titles.