2. May 2010 16:05
Update: See post http://nolovelust.com/post/Nokia-N900-PR12-Officially-Released.aspx for official relese of PR1.2
It took so long but it leaked :)
File name: RX-51_2009SE_10.2010.12-9_PR_COMBINED_MR0_ARM.bin
Apparently it is RC of PR1.2 and was posted to http://talk.maemo.org then got deleted around after 12 hours by administrators due to it being unauthorized distribution.
You are probably looking for download link too but I can't distribute it here. Try usual places
Please note that according to tweet from nokia conversations it will damage your phone http://twitter.com/nokconv/status/13299314191