GorillaX has done a lotta homework and has compiled a list of all of the XBox games in developement.
From the site:
The Official un-Official XBox Games Reference Library
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Everything you see here, is public information gathered from the internet press.In making this compilation, the rule of thumb was to make absolutely NO assumptions, and to have press confirmation on everything. As a result, the main table has about 98% accuracy of information.
Sources: MSXBox, GameSpot, IGN, FGNOnline, Daily Radar, and CVG.
All the titles on the main table ARE coming to XBox, most of them will be in the first year or two (this is only the first generation of XBox games). Provided for each title, is it’s name, genre, release data, and links to their developer(s) and/or publisher(s).