When the 'head' of a force it taken out, there is always a fight between the subordinates to see who gets to be the new leader.
Assange has been taken out of circulation. Sure, he has a dead man's switch, which has been activated, but the data is in the hands of those subordinates, and it is up to them to release it. One can assume they will do so in a manner that benefits 'them' the most. These tweets are part of the juggling for position.
One Twitter user I follow who has been in the know and appears to be connected with Anonymous is very worried that Wikileaks has been compromised and is now a NSA honeypot. He is advising all Anonymous people to NOT upload files to Wikileaks.