Just in case you haven't seen this news already, Frog God Games has launched a Kickstarter for the Borderland Provinces, which is the campaign area where Rappan Athuk and Lost City of Barakus are located.
Link: https://www.kickstarter.com/projects/froggodgames/the-lost-lands-borderland-provinces
Link: https://www.kickstarter.com/projects/froggodgames/the-lost-lands-borderland-provinces