The last content pack to hit Europa Universalis IV was Third Rome back in June. Before that, Mandate of Heaven in April. Only one of those counted as an expansion pack, so another is due very soon. Cradle of Civilization sounds very serious indeed.
Set to release in under a month on November 16, Europa Universalis IV: Cradle of Civilization focuses on the ever-changing Middle East and Central Asia landmasses.
Much like any expansion to Paradox's flagship Grand Strategy sim, Cradle of Civilization exists to give the chosen areas their time to shine with more accurate detailing and a share of the spotlight hogged by other regions over the years. Stretching from the River Nile to the River Indus, the nations surrounding these waters will all follow their choice of 7 schools of Islam. Good relations with other schools can share their benefits. Of course, war doesn't do relations any good.
Though some shady tricks of the trade, Advisors can be upgraded above their previous Level 3 limit; but doing so requires you reduce the economic output of a province and use that reclaimed cash for the training. A new addition to all armies comes in the flavor of 'professionalism'. Focusing on this new stat by choosing to use native troops over foreign mercenaries makes them stronger overall with drills then used to fortify their skills further.
There's a long going on with this next expansion that's best described by the game director, Jake Leiper-Ritchie, rather than a simpleton with no experience with the title in question. It's 5 minutes long, so use this as your break time.