United Arab Republic
The United Arab Republic is a potential, formable nation. It will appear when Arab nationalist factions win their respective civil wars, like the Free Officer's Organization in Egypt, the Ba'athists in Iraq, among others. After the oil crisis these nationalist countries will combine (if they have a land or sea link to each other) into the United Arab Republic.
The nation itself is quite unstable however. There are many forms of Arab nationalism which causes great divides in the nation, on top of encroaching German influence.
Whilst no content exists for the United Arab Republic beyond its unification and national spirits it has been confirmed that it will receive more content, including a superevent, in the "Black Gold, Red Sand" upcoming update.