@Jimmy Page... Re: Ah, yes, the famous "afraid of the US" bogeyman.
I think to answer your question you have this:
If Obama grants Manning clemency, Assange will agree to US prison in exchange -- despite its clear unlawfulness https://t.co/MZU30S3Eia
Why is Assange making this statement?
The answer is that while there are no charges pending or extradition request, Assange is fearful of the US.
Its not for publishing the Wikileaks documents. He actually has some legal protections under the claims that he is a journalistic organization. the "Ellsberg" SCOTUS decision back in '71 allows Wikileaks and Assange to claim that they published for the greater good. Any decent lawyer would be able to win that case.
But the larger issue... Assange may have also participated in the break in and subsequent theft which would carry a heavy prison sentence. We know of this because of evidence revealed in Manning's Article 32 hearing, and if true then Assange is an accomplice. Yet this was never produced during his court martial because Manning had admitted to the facts of the theft. Nor did Manning make any public statements concerning Assange. Assange's fear of the US tends to lend credibility to the claim that he helped Manning break in....
The whole mess in Sweden is Assange's own doing. Boys will be boys and that's what he gets for taking women for granted. (When in Sweden, play by their rules...) So the whole issue there is that these women should get their day in court, something Assange has deprived them from having...
The point is that the fear of extradition from the UK or Sweden is over rated. If he did go to Sweden, and he did get found guilty, and he did get prison time... He could be extradited to face a trial in the US, however that scenario would be unlikely. The issue would have to go through both the UK and Sweden. Then there's the issue of bail jumping. Jail time for that. Again the US could extradite him, but he could again fight it and who knows.
After all of this... he goes back to Australia.
And here... he yet again could be extradited to the US. Here, however, unlike in the EU/UK, Assange was convicted as a teen for breaking in to US Systems. This could come in to play and would make the extradition much easier.
So if Assange did assist in the theft. He does have reason to fear the US, except that he will not be rendered in the EU or UK, but in Australia. (I know Brexit won't happen for a while but just getting used to the idea...)