With regard to the pirated Sivaji songs available at net, AVM Saravanan could not speak much about it. The way he responds to query reveals that the song may not be in the movie as what we heard in the net. It might be a track song with some background and chorus missing from the original song.
AVM Saravanan has no plan to release the songs earlier and it will be done as per what they have planned earlier (4 April 2007). There is gossip that Telugu audio will be released on 26 March 2007 and Rajini might attend if the function is held there! This will affect Tamil Rajini fans as Rajini doesn't give priority to Tamil fans. This is what he did for Baba audio release.
There is high chance that the movie will be released at the end of April or early May 2007 as the background music yet to pinned for the movie!