The official U.S. PlayStation blog has a comprehensive FAQ about Playstation Move published, which addresses many issue of the gamer and in particular on technical issues.
In the discussion with the users there were many questions, one such question was, Will I need to update my games to enable PlayStation Move support? If yes, will it be free? Can you guess what the answer to this is?
That need not be always so, However, according to the blog moderator, this always depends on the Publisher if the update will be free or not.
Playstation Move games are specifically designed for motion controller although many developer has decided to add Move support to their existing title for example Heavy Rain.