It won't be 400cr for sure.
First they mentioned 150cr & then post Bahubali 2 they're quoting whatever number they want to claim their's is the expensive film.
Sundar.C is the director, Jayam Ravi & Aarya are the actors even though Shruti is the main lead. Will be shot in 3 languages for 2 years. Budget will shoot up but not upto 400cr. The only proper name that justified this magnum opus is A.R.Rahman.
Sundar C last directorial was Aranmanai 2 & before that Aambala. Before that Aranmanai 1. Just giving you an idea.