Some minor issues in the 1.6.0 release have been corrected:
* (bug 5458) Fix double-URL encoding in block log link in contribs and contribs
link in block log
* (bug 5462) Bogus missing patch warning in updater
* (bug 5461) Use of deprecated "showhideminor" in Special:Recentchangeslinked
* (bug 5471) PHP warning when allow_call_time_pass_reference is off
* Update to Finnish localization
The instructions in UPGRADE have also been updated with more detail.