Hey,
Quoting from the announcement:
The interface strings of Drupal 6.0 are officially frozen now. Only critical fixes, and corrections may be made to the interface text from this point forward. You will find that this release comes with the most interface text updates ever, and is hopefully also easier to translate. Translation templates are available to teams working with Gettext PO files directly. Note that the placement of translation files, and the Drupal 6 translation package structure is different from Drupal 5, so be sure to read the instructions so you can get the most out of your existing Drupal 5.x translations.
Links: http://drupal.org/drupal-6.0-rc1 http://drupal.org/project/drupal-pot http://drupal.org/node/202631
Gabor