As a matter of fact, careful searching will reveal one or two bits that OXM didn't actually run. And feel free to come up with crazy theories too. We love those.
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The Warthog spawned on the Zanzibar demo at E3, so my guess is that yes, they will re-spawn. Just noticed it now looking for OXM hidden treats, but the rocket launcher pictured in GICover.jpg is definitely not the dual-barrell type we are used to. Looks more like what was called the "anti-air" launcher in the evolution of halo vid.