A solution to the Semantic Mediawiki (SMW) problem been found and SMW has been reenabled. SMW is currently rebuilding properties on various pages, until that is done expect to see further "not found" issues or incomplete item lists. Work on porting SMW templates to Cargo continues on as well, potentially causing temporary disruption to pages.
See Wraeclast for more information
Each act takes about 12 months to complete depending on available development resources 
- Paul Younger (October 21, 2013). "Path of Exile Interview with Grinding Gear Games CEO Chris Wilson". PC Invasion. Retrieved June 23, 2016.