I would personally LOVE to get my hands on some Bungie proprietary tools. However, they haven't released development software since the Myth series. (Unless you're counting Forge) Part of me thinks it's a shame reallly, especially with the previlence of small-scale indy game developers out there now looking for a good engine toolset to streamline their workflow. And after a good look at Grognok during the Moon Base video, I can honestly say it looks pretty intuitive.
That said, I can be hopeful that Bungie might pull a few magic strings at let it's community play around in it's sandbox. But I'm not counting on it as a garunteed feature. (And least in terms of a full release of the tools) I guess we'll all just have to work hard and try to get a job at Bungie if we want some quality time with good ol' Grognok.
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They did release some development kits for Halo CE and Halo 2, but they were only for PC version.