They must or they wouldn't do things like this.
However, during a recent and rather attractive demo of the rather excellent GTA: Vice City Stories, representatives for the developer indicated - a little surprisingly - that the newest and hottest PSP GTA offering is unlikely to make the transition back onto PS2 as the developer 'has no plans to do so'.
If they loved me, they would release Vice City Stories for my PS2, or preferably my XBox so I could play the game without having to buy a craptacular PSP. That's the opposite of love. Damn their eyes!
What Would Matt Do: Stabbity stab stab!