We regret to announce that sales of new Hunters’ Licenses will be terminated on December 6th 2007. All subscription-based services for Phantasy Star Blue Burst will be terminating on Jan 9th, 2008.
If you have an active subscription terminating between December 9th 2007 and January 9th 2008, your Hunters’ License will be valid until January 9th. The game servers will be made available to all registered users from January 9th 2008 until March 31st 2008.
So, there's a period of about two months of free play for anyone that has registered and played Blue Burst before. After the servers shut down, the only official PSO servers in the US will be Xbox servers. A rumor from the Blue Burst board admin says those are going down soon as well. That would leave private servers as the only way to play PSO online.