Yes it's running on a modified form Halo 4's engine but it plays and feels like Halo 2.
English
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The multiplayer is running on the Halo 2 engine (for Halo 2) either that or I misheard them
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The campaign is the Halo 2 engine but they reworked the graphics to make it look like next gen.
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The Halo 2 Anniversary MP is running on a modified Halo 4 engine that imitates Halo 2 gameplay. The normal Halo 2 MP is just Halo 2 MP with nothing changed.
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That's good