In the days following the Easter celebrations Pope Benedict XVI took time to reflect on through the form of a letter, the liturgical use of the phrase "For you and for many" that is used at Mass. With the third edition of the Roman Missal this phrase has been restored and it is has caused some people to wonder why the change after so many years; the priest had been saying "for all." The Pope's teaching is clear to why our liturgical praxis needs to be coherent with sacred Scripture, coherent with the Lord's own teaching.
Vatican Radio ran a piece on this issue here.