Mani always make sure not to release any pictures of his movies before the release. The shooting been held in the forest area is helping the director's cause as no cars could reach the site and they need to travel in jeeps.
Arriving in cars, the stars get into jeeps for the final journey to the shooting spot. Even at this changeover point, Aishwarya is covered with a blanket or umbrella.
Well, it seems to be a z-level security for the actress.