These are some of the features that we would like to implement. However, more often than not we will add new, previously unplanned, content to the game at a higher priority, and some features we implement in their basic forms and continuously revisit/tweak them as we go. 

Disclaimer: We do not make any promises when or how many of these features will be implemented. We are very eager to see these features in-game ourselves though.
 

Survival/Creative Experience

• Leather working

• Immersive/Deeper combat system
• Herbalism / Brewing System and Potion Effects
• More metal ages
• More wildlife, flying and swimming creatures
• Extensive Story / Intro Mode
• Seasons and Seasonal Farming
• Fruit trees
• Alcohol Preparation in Barrels
• Villages, Trading, trade goods and dynamic market pricing
• Improved Animal AI and improved Path finding, herding behaviors
• Mechanical Power that allow various forms of automation
• Boats and Minecarts. If technically feasible: Multi-block Ships.
• Customizable Play styles for extra hardcore or more easy going survival game play
• Complex localized Weather patterns, various forms of rainfall/snowfall
• World Generation Customization Screen
• Large scale world generation patterns, such as continents and regions of distinct flora and fauna
• Large variety of dress pieces the player can wear, some craftable, some only rarely found, player emotes. Armor system.
• Player Progression System (Leveling,  Gear Attributes, Skills)
• Procedural Dungeons
• Richer caves (large geodes, underground plant life)
• Replace the 3x3 grid crafting system with something more immersive
• Improved WorldEdit Gui, user friendly area selection/manipulation
• More Multiplayer Features (Party system, group buffs?, improved networking, etc..)

Game Engine

• Virtual Reality Support
• Easy game server setup
• Easy mod installation
• Advanced Mod Manager
• Auto updater
• Highly scalable multiplayer servers
• High fidelity shader effects (water caustics, reflective surfaces, depth of field)
• Download music in the background (90% reduced installer file size)
• Improved performance for greater view distances (cave culler, greedy meshing, LoD for very distant terrain, variance shadow mapping)

Web

• Official mod hub that integrates into the game
• Improved public server listing