Some of websites reported that there is Allu Aravind's hand behind this. When inquired close sources of Thamanna on this they revealed the actual reason. They said that Tammu is planning to act in Tamil after completion of these movies. It's been a while she has been away from Kollywood and now she wants to make a come back before it's too late, after all it's Tamil movies that made her successful.
One of Thamanna's friends revealed "Thamanna will complete at least two of these movies by next month. She was recently approached for Bollywood film Himmathwala and she rejected it as she will be signing a Tamil project soon". Kollywood will welcome her move as they are in dire of heroines as all the top heroines busy in Tollywood. It takes a lot of guts to deny acting with MaheshBabu, who is on a roll with successive hits. Let us hope this will not do any harm to Thamanna's future.