As noted, the Roloffs are coming back to TLC in a six episode series starting in November called "Little People, Big World: Wedding Farm".
A guest at one of the weddings that was filmed for the show posted a blog about the wedding they attended at Roloff Farms.
If you want to see the venue, check out their blog:
Blog from guest at a wedding held on Roloff Farms for an episode
They mention that there is now a rule that they are not allowed to post pictures of the Roloffs.