The original Rule 138 was updated on the Europarl website on 9 March, with no changes.
A text was renewed concerning multilingualism in the upcoming, seventh term of the European Parliament (2009-2014). I’ll want to take some time to read through all the explanations of vote.
GrahnLaw posted a summary (scroll down) of the transitional language rules covered by the renewal. He includes a list of earlier (2007) provisions too.
There’s a nice section in the 2006 book by Barbara Pozzo and Valentina Jacometti, Multilingualism and the harmonization of European Law , explaining how Rule 139 was created to give the Parliament flexibility in dealing with the new languages added in 2004.