From the site's official Twitter today:
Paddy Power opens betting on the fate of Julian Assange paddypower.com/bet/novelty-be… (supporters: please bet *against* freedom inorder to hedge)— WikiLeaks (@wikileaks) November 1, 2012
(i.e if he doesn't win freedom then you can use the money to campaign for his freedom)— WikiLeaks (@wikileaks) November 1, 2012
That doesn't sound particularly confident. The market has actually been up for a few months, and specifically requires you to bet on how Assange will leave the embassy. "UK police car" is the favorite at 16/8 odds. More adventurous punters can take 100/1 odds on "jet pack."
As for Assange himself, he's still holed up in the embassy. Ecuadorean officials have expressed concerns about his health, but fashion designer Vivienne Westwood who met with him recently (why not?) says he's just in need of fresh vegetables.