Yes, Snowden will be assassinated by the United States government, because the government wants to send a message to the rest of the people of the United States. The United States government wants people to be quiet and comply with their data harvesting, no matter how invasive it might be. Silencing Snowden will make other people afraid to tell the truth about the United States.
Snowden is actually disguised as SnowMan: half man, half snow. That's why his last name is Snowden. "Den" refers to "then", meaning after he destroys Earth, he will "then" travel to other planets. He will probably rule the Earth in early 2014 and then destroy it in 2015. Let's hope we destroy him before he destroys us, but I'm afraid that's not possible. The way he destroys object is absolutely horrendous: he uses his snow power to freeze the earth, then when it's completely frozen, he destroys it with his sidekick Hammer Head.