New firmware, version 12.0.013 is available for download using Nokia Software Updater.
I just installed the new firmware. Downloading the update may take a while as it's 113.6 MB. After a very quick testing, the GPS seems to find a fix a lot quicker than before. Now there's also support for Assisted GPS, which you can switch on from Tools -> Settings -> General -> Positioning Methods. In addition to Positioning Methods, there's also a new setting for Positioning Server.
