Yes, you read the headline correctly. 343 Industries revealed a number of new Halo goodies at their preview event last night, including that the Halo 4 Warthog would be hitting Forza Motorsport 4. The folks at Turn 10 showed off the new ride as they checked out what was under the hood. As a bonus, the Super AI Cortana narrates your experience as you gaze upon the Warthog and hear war stories from the Halo universe.
Sadly, though, you can't actually race around with the Warthog in Forza 4. The ride is only available in the Kinect-powered Autovista to look at. It won't be obtainable right away; you'll have to unlock it in some undisclosed way.