Rajinikanth, Kamal Haasan, and Surya in Kaavalan?

I got a source from Wikipedia that Rajini, Kamal, And Surya are acting as a guest appearance in the movie. Rajini and Kamal come in the Kadhal Kacheri song and Surya cwritten a song for Kaavalan.

The source:

Close sources say that actors Kamal Haasan and Rajnikanth will be doing a guest appearance. Rajinikanth will feature as a guest in the song kadhal kacheri whereas actor Surya will be appearing in a fight sequence.Rajinikanth himself has confirmed that he will be appearing, although for only about a minute.Rumours have also spread that Khushboo will perform in the song Step Step as an item number.