Getting the starter terrain posted for sale via the WorldWorks store is totally in Simon's court (Creator of Rez). The terrain I did for that set was subcontracted and I was paid a flat fee for doing the work. We would have to create a new distribution contract to make those files available here. I'm not sure where Simon stands on that but I will send him a message and find out.
I was hoping to create terrain for all of the expansion sets for Rezolution but things didn't work out that way. As a matter of preference the Rez crew seems more content with scratch built terrain over cardstock. I'm not cutting them down for that, it's really hard to get people over to the cardstock side of the force
So unfortunately the terrian you see at Cons for Rezolution is typically homebrew.
This topic has given me a unique idea however...Give me a few days
*EDIT*: I should mention that there has been incredible user support for our terrain at Rezolution.