To clear up all confusion, Kotaku has confirmed this is a "real" GTA game, not a minigame of any sort, but a full featured game being released on the DS. It will feature D-Pad aiming and many features we saw in GTA IV. One including a PDA (instead of a cell phone) for a lot of interactions. The list they include is "email, contacts, map, music player, GPS, [and] stat-tracking." The stats can supposedly be uploaded to Rockstar Games Social Club website via a Wi-Fi connection to keep track of in-game progress.
Here is a list of all the features:
- True GTA game - sandbox gameplay, open-world environment, gritty crime narrative.
- Isometric camera angle
- Cel-shaded polygons w/ black borders
- good touch-screen implementation - "tasteful" minigames, streamlining interface
- UI based on a PDA - hub for email, contacts, map, music player, GPS, stat-tracking
- stats uploaded to Rockstar Social Club website via Wi-Fi
- finger-sized icons
- missions designed for shorter periods of play, arcade quality
- aiming with control pad, auto targeting with R button
- subtle autosteer
- if you fail a mission, you can jump back to the action sequence
- chain gun, flamethrower
- good portion of Liberty City is modeled in the game (different routes than console games)
- no probems with load times, draw-in or frame rate
- lots of pedestrians, cars, etc on screen
- Wanted system - objective is to disable police cars any way possible
- real-time weather effects, 24-hour day/night cycle
- lots of radio stations to listen to (more instrumentals than vocals)
- 800,000 lines of hand-optimized source code (hey, the people like the info, right?)
- no details yet on multiplayer/Wi-Fi features
Now most of this is considered rumor right now, but the info is taken from a November issue of Nintendo Power Magazine, so we can be pretty certain that this is the real deal.