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Currently at the moment we have a forum section called
Driver: 5 mainly because there is no real name for the next game and I don't want to get people confused with Driver: Parallel Lines as Driver: Parallel Lines to some is Driver: 4 and even Driver: 5 to some is drIVer or Driver: 4.
At the moment it's really confusing until Reflections Interactive and/or Ubisoft publicly release the name of the next driver title and the day that happens the day the forums name will change.
So in the end I have just called it "Driver: 5" so people don't get it confused with Driver: Parallel Lines. Because in some places they still call DPL Driver 4.
If the series returns with Tanner we all think reflections will call the next game drIVer. IV being 4 in roman numerals.
Basically what Moonchild is saying is correct, infact there is no real wrong answer in this because we don't know anything about the next game yet. Only that it exists and is coming to next generation consoles.
I too think it's a really confusing subject to talk about and sometime in the future the next driver game will have a name so then we wont have to worry about it.