New firmware has been released. Main thing seems to be it can do AGPS as well and various bugfixes. Install the Nokia Software Updater app and it should download it if you've got the correct product code.

Version 12.0.0.013
19-06-07
RM-159

Official Nokia changelog
Not yet known

Known fixes
Not yet known

Changes
A-GPS (assisted GPS) now implemented

Known problems
Maps is not yet updated

New problems (regressions)
Not yet known

This firmware is available from Nokia at http://www.europe.nokia.com/softwareupdate