Bungie just posted to Facebook about how GI will have exclusive info and art they (Bungie) can't/won't publish to Facebook.
Make sure you grab a copy!
Edit: It appears there's only some new concept art, no new information (at least nothing that wasn't at reveal). Thanks all for the input!
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Guys, 4/13 is April, not March. The new info won't be out until next month...