UPDATE: Pro now comes with a free copy of Creativerse: The Definitive Edition, launching soon!
More details here:

Go Pro with these amazing features:

• Create multiple worlds!
  
• Unlock advanced world customization options, including Creator Mode!
  
• Sail the skies with the exclusive Glider!
  
• Light your way with the flashlight!
  
• Increase your load with +20 slots in your backpack!
  
• Run farther with +100% more stamina!
  
• Stake 2 claims for free in every world!
  
• Get reduced prices on everything in the store!