The new Rising Tides map just got the 4x treatment. In case you've only just now washed ashore, the Rising tides map hosts a multitude of features listed here.
In case this is your first time into the foray of 4x, this means that ALL timers will be running at 4 times the speed. So you can expect:

• 128 Playable Nations
  
• New starting units, borders, buildings, insurgents, and more!
  
• 4 times faster Research
  
• 4 times faster Travel times
  
• 4 times faster Day times
  
• 4 times faster Combat times
  
• Basically... everything is 4 times faster! 1 realtime hour = 4 ingame hours