APB Community Officer Ben Bateman broke the news just a short while ago: "APB has been a fantastic journey, but unfortunately that journey has come to a premature end. Today we are sad to announce that despite everyone's best efforts to keep the service running; APB is coming to a close."
The announcement is followed by statements from many members of the APB team, and while there is not a specific shutdown time at the moment, Ben says that the servers are currently up and invites everyone to come say goodbye.
We at Massively wish everyone at Realtime Worlds and APB the best of luck in the future.
[Thanks Brian for the tip!]
[Update: We've learned that the the game is expected to be taken offline within the next 24 hours. We'll keep you posted as the story develops!]