Come on mate seriously, if this was the case then you would see a lot of good quality rips that come out before a movie even hits the cinemas, how many times have you seen this happen?
Movies do go into DVD production very quickly after they are released in cinemas but they are kept under lock and key and governed and treated as if they were currency, it's like trying to sneak money out of a bank: )

If were lucky we might get are hands on a DVD screener way before the release date, otherwise its the same process as usual, cam, R5, then dvdrip.