Here's a cynical interpretation: Hong Kong makes zero sense given that they are a) within Chinese sphere of influence and b) frequently extradites to the US. He's go other sensitive documents he may sell to the Chinese in exchange for money and sanctuary. So maybe that was the plan all along. Everyone focuses on the NSA wire-tapping scandal (which, honestly, I think everyone assumed was happening for years), and he gets a payout and some cover.
Too cynical?