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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They publish a digital version of the magazine so as soon as the digital edition goes out the pictures will be all over the interweb.