We've seen a teaser of Grand Theft Auto: Vice City imported into Grand Theft Auto IV's visual and physics engine, RAGE. Another mod team is hard at work on the same conversion for Grand Theft Auto: San Andreas.
At work since December, the team hopes to release a public beta this fall. Above is about 20 minutes of footage from what they've built so far, beginning at the Bone County Airport and plane graveyard, flying over San Fierro and the Gant Bridge, touring Las Venturas at night, plunging from atop Mount Chiliad, and much more.
Vehicle conversions and many other details still need work, but if you are intimately familiar with the San Andreas map, this is a mesmerizing trip down memory lane.