Yuvan Shankar Raja has made this official annoucement.
Also the Intro song of Ajith in Billa 2 has been sung by Krish. The song is titled as 'Don...Don...Don...' and have been tuned in the classic Rock & Blues (R&B) style.
So with some soul-stirring Guitar and Drums and stylish visuals, Thala is going to make his rocking intro in Billa 2 adds sources.