Masthead originally intended to convert the subscription-based game to a free-to-play business model but opted to pull the plug entirely due to a lack of investor interest. As of today, though, there's a countdown timer on the official Earthrise website (as well as a new background graphic that shows off the game's sci-fi battle action).
Has Masthead found an investor after all, and is Earthrise making a comeback? We'll see in a little over five days, but feel free to speculate in the comments!
[Thanks to IMN for the tip!]