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Next expansion will have terraforming and player built settlements.
You can read more info from the following blog posts:
Part 1: http://blog.perpetuum-online.com/posts/2012-02-15-the-road-to-pbs-terraforming/
Part 2: http://blog.perpetuum-online.com/posts/2012-03-01-the-road-to-pbs-building-and-planning/
Part 3: http://blog.perpetuum-online.com/posts/2012-03-31-the-road-to-pbs-islands-building-types-and-control/
Bump, This looks interesting to say the least, quite possibly the second Perp. expansion together with some polished graphics hopefully.