The Firefox drivers are planning on the Firefox Release Candidate 1 build for next week, hopefully between the 18th and the 20th of October. We now have the build process in place to (hopefully) produce localized builds at the same time as we release the English build.
So that's the plan. We would like to release Firefox RC1 in as many languages as possible next week. John Granrose and Chase Phillips have been working feverishly to get the localized builds and tinderboxen set up, and this work is almost completed (you will probably start seeing localized binaries as soon as tomorrow morning).