http://www.guru3d.com/news-story/sid-meiers-civilization-vi-rise-and-fall-available.html
 
I think everyone knew the expansion pack was coming but now it is here. Here are some items of interest from the expansion pack which you may or may not like. I'm still debating about where to buy the expansion pack or not myself. I like some of the additions.
 

• GREAT AGES: As your civilization ebbs and flows, and you reach milestone Historic Moments, you will experience Dark Ages or Golden Ages, each providing specific challenges or bonuses based on your actions in-game. Rise triumphantly from a Dark Age, and your next Golden Age will be even stronger - a Heroic Age.
• LOYALTY: Cities now have individual Loyalty to your leadership - let it fall too low, and face the potential to lose your city to its own independence. One civilization's loss can be your gain as you inspire Loyalty among Free Cities throughout the map and further expand your borders.
• GOVERNORS: Recruit, appoint, and upgrade powerful characters with unique specialization bonuses and promotion trees to customize your cities, and reinforce Loyalty.
• ENHANCED ALLIANCES: An enhanced alliances system allows players to form different types of alliances and build bonuses over time.
• EMERGENCIES: When a civilization grows too powerful, other civilizations can join a pact against the threatening civilization and earn rewards, or penalties, when the Emergency ends.
• TIMELINE: Review your civilization's history at any time with the new Timeline feature, a visual journey through the Historic Moments that you encountered on your path to victory.
• NEW LEADERS AND CIVS: Nine leaders and eight new civilizations are introduced. Each brings unique bonuses and gameplay, as well as a total of eight unique units, two unique buildings, four unique improvements, and two unique districts.
• NEW GLOBAL CONTENT: Eight new world wonders, seven natural wonders, four new units, two new tile improvements, two new districts, fourteen new buildings, and three new resources have been added.
• IMPROVED GAMEPLAY SYSTEMS: The Government system has been enhanced with new Policies and additional improvements have been made to existing systems.

I'm waiting a bit to play - I'm a huge Civ fan but waited almost an entire year to get Civ 6 just because it didn't impress me - even now I would still rather stick to Civ 5. 
Hopefully this will do what BNW did to Civ V although I think this is more like the GNK expansion of 5 - so hopefully we'll see another massive expansion.   

ill give er a looksy