Nifty futures has rolled around 68% vs 73% with respect to last month, and the open interest for the new Aug contract is lower by around 30 lkh implying cautious outlook or profit booking at 10000 levels. BankNifty futures rolled at around 76% vs 69% compared to last month. However the open interest of Bank nifty in this series is more by around 2.5 lkh, implying fresh long build up.