And that decision is up to the country who has him in custody, which is the UK right now. They've refused extradition for hacking before in the case of Gary McKinnon [1] due to fears that he could end up in Guantanamo so we'll see, now that Guantanamo is effectively closed for entry.

[1] https://en.wikipedia.org/wiki/Gary_McKinnon#Extradition_proc...