Firefox package in testing/ has been upgraded to the latest Beta release, Beta 9. Mozilla confirmed that they will release the final version of Firefox 4.0 next month (February). The exact date is still not yet clear, as they are still trying to squash all the remaining bugs in this Beta release.
Meanwhile, Kdevelop and Kdevplatform are now upgraded as well in -Current. The other KDE packages are already in stable state and no need to upgrade nor patch for now.