About the game or my thoughts of the game after its release date?
From what I know about the Jet Set Radio (or Jet Grind Radio) is a rollerskating platformer where the player has to spray can existing tags to claim the area their territory. Think of it as Tony Hawks Pro Skater, but in cel-shaded visuals.
The last time I remember hearing about the HD version is that the controls will be fixed since the original for the Sega Dreamcast was pretty difficult to play through. The developers hold a contest of graffiti designs by participants that will be shown in the game, just like the creation of the Death Spiral from Ratchet and Clank: A Crack in Time.
My only concern about the game is that 30% of the licensed tracks that were in the original will not make it to the HD version, but at least the original tracks will make it to the game.