Who is the hero of Upcoming Movie of Director Gautham Menon ?

Gautham Menon has directed multiple films with Simbu (Silambarasan) as the hero, including Vinnaithaandi Varuvaayaa (2010) and its upcoming sequel. At the time this question was written, this would have been the correct answer for his upcoming project. The other options - Kamal, Suriya, and Madhavan - are also Gautham Menon heroes but for different projects (Kamal in Vinnaithaandi Varuvaayaa Telugu remake was considered but not materialized; Suriya in Kaakha Kaakha and Vaaranam Aayiram were earlier films; Madhavan hasn't been a Gautham Menon hero in major films).