It seems everyone is jumping the gun on announcements, even Julian. No acceptance of extradition can be made until the US as applied for extradition with specified crimes and substantiated evidence. With the current state of US politics clearly under the destructive influence of finance corporations and arms industry, pretty much any charge would be made, no matter how spurious, with the intent of extended life threatening imprisonment drawn out by a purposefully extended trial process designed to be it's own punishment ie years or prison under the worst possible conditions, whilst the trial drags on and on and on.
So Assange needs to correct his statement to, I am waiting for the US secret punishments via corrupt prosecutions to come clean with the secret warrants. Ideally Assange should return to Australia, as an Australian and should the US wish to attempt extradition, they can do so in the Australian legal system. Assange has a legal responsibility to ensure that in legal relations between Australia and the USA, that the USA is forced to adhere to the principles of Australian law when seeking application of law from within Australia.
Julian has a moral responsibility to ensure that the US government is forced to treat with Australian citizens under Australian law. So out of the UK and back to Australia and then lets see what will happen. Will the UK want him back, will Sweden seek extradition, will the US just slink away too embarrassed to put their claim before the Australian high court (I am sure there are others that the US wants to drag out of Australia for persecution via corrupt prosecution, for which they are also to cowardly to put before a real court for an extradition claim).