Seems like GPG is done with developing content for Age of Empires online:
creating top-tier content, as we have been for the last year and a half, is very expensivetoo expensive to maintain for long, as it turns out. We can no longer afford to keep creating it. AOEO already has a very large amount of high-quality, hand-crafted entertainment, and adding more is no longer cost-effective.
There will still be bug fixes and a bit of smaller content added and at least the servers won't go offline as you can read here. But how long will they stay online I wonder if the game isn't profitable like they said?
I doubt MS will be interested anymore to make an Age of Empires game after this. The series is most likely dead.:(