The History of Source 2
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Source 2 was announced at GDC 2015, with a promise that the tools will be made available in Early 2015.

The Source 2 Engine was officially revealed as part 3 of the Dota 2 Reborn announcements on June 15, 2015.

Dota 2 is the first game that will recieve the the Source 2 Engine treatment. Source 2 includes technology for rendering improvements, performance optimizations, higher fidelity content, and richer, more dynamic games.

Improvements over the Source Engine:

  • Lower Latency Input: The engine Responds faster to mouse clicks and keyboard events.
  • Tiled Map System: Specifically geared towards dota 2 the Tiled Mapping system provides for an easier to manage and more consistent workflow when developing custom maps.
  • Enhanced Performance:
    • Highly scalable: Runs Faster on older machines, Maxes out high end desktops as well
    • Multi Threaded: Uses all available cores
    • 64bit OS
    • Use all available memory
    • Supports DirectX11, OpenGL Vulkan
    • Virtual Reality Ready
    • Content Streaming
    • Improved Audio
    • Physics: Includes Valves inhouse Physics Solution for more stable collisions and simulations
  • Rendering Improvements:
    • Less Constraints: Maps in Source 2 can be authored using powerful geometry editing tools and may contain complex meshes which are free of convexity constraints
    • Freedom: Designers can create worlds that were not possible to build in the previous engine
    • Lighting: Unified lighting system ensures all game assets have access to the same rendering feature set
  • MultiPlatform: Natively uses OpenGL rather than a wrapper so as to improve performance