Well... 12 Months free for now... Better then nothing right? I actually loved the game back in the day but just couldn't see myself paying for a MMO FPS game. It just didn't have the type of holding power that normal MMOs have but I guess for free its worth going back to.
If you don't know what Planetside is then well... look it up! Actually imagine BF2 in a futuristic world and MASSIVE. Now add the ability to take over bases, towers and just throw in alot more chaos... thats what you have.
Some of the new changes to the game sound good aswell...