You're right in saying 3DRealms had 10 years to work on it. But the last iteration they were using was a modified Unreal Engine 2.0, if I remember correctly they re-worked the engine like 2-3 times completely. Let's just say their graphics wouldn't be up-to-par for the 360 or PS3 and especially PC for this day and age. They are most likely xbox graphics.
I am surprised it is done already though and they are just polishing it up.
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