The firmware is due to be released on June 2nd.
I wonder why it was announced ahead of this date, it would be better to say 'OK, guys here it is...'. PR spin I suppose, trying to make some mileage out of a bad situation.
Good news though.
pdn had a post a couple of days ago about a guy who wrote a hack for his 5DII....they mentioned he would make it public soon....i am guessing canon did not want people to take matters into their own hands:)...either way, the rumor about this firmware update has been floating for a while....