Here is the petition. http://www.ipetitions.com/petition/exjwspetition/?utm_medium=email&utm_source=system&utm_campaign=Send%2Bto%2BFriend
I'm not involved with that petition, but I have signed it and I think it is a good idea. There is a thread here that discusses the idea of having a petition about recent Watchtower articles labeling apostates as "mentally diseased" and praising the "slaughter of apostates". http://www.jehovahs-witness.net/jw/friends/216478/1/Should-There-be-a-Petition-Asking-the-Watchtower-Society-to-Retract-its-Mentally-Diseased-Statements
I think it's extremely unlikely that the Watchtower Society will ever apologize or retract those statements. However, a petition could be newsworthy and might highlight the stubborness and lack of compassion of the Watchtower Society. I also think it is important that the Watchtower Society recieve a formal request to retract it's statements as this could assist prosecutions and even lawsuits in certain countries if the Watchtower Society is properly notified of it's damaging statements and refuses to issue a retraction.