- CmdrScott1701
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Legally, they cannot alter the title in any significant fashion to my knowledge because they handed over the rights to Halo over to 343 Industries. Every game's server however, is always foremost under the control of Microsoft, although the developers do play a role.
If you wish, send 343 Industries your thoughts. I'm sure that if they wanted to add anything such as maps or other down-loadable content, they could.
I would advise you not to get your hopes up, however. They are already working on a continuation of the series with Halos 4,5, and 6, and probably do not have too much time to review Halo 3's beautification.