Bungie teases something for April 9
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Bungie's included "P.S. 04/09/09" at the end of its weekly update, which almost certainly points to the release date of Halo 3's Mythic Map Pack.
That said, it's Bungie. So we may get something new on Halo: ODST. Or not. Who knows?
Bungie does.
Thanks, IGN.