Well it seems that word is spreading that the next GTA will appear on the PS3. Though this is no suprise to many avid fans out there as R* have announced personally that the next game will require a greater system.
Following the start of E3, word quickly flew around after the revealing of the PS3 about what will happen with GTA. Through this commotion it was set forward that the next GTA game would actually be a flag ship title, this though is unfortunately not true.
What Rockstar did confirm, however, was that it would be supporting the powerhouse system in the future and that it's looking forward to creating living, breathing worlds with the Cell technology.
Though Rockstar have not announced anything GTA wise for the PS3 yet they state they are strongly behind the hardware, hinting that they are ready to move their production of games to the new console. Which most probably means that GTA will be on the PS3
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News source: GTACentral.net