Roadmap

Remaining v1.0 features (in order):

Physically based renderer (Planned for Q3 2017)
Linux/Mac ports (Planned for Q4 2017)
v1.0 BETA release (Late 2017/Early 2018)

Post v1.0 features (in no specific order):

Sprites & 2D rendering
2D physics (Box2D or Chipmunk integration)
2D animation (Sprite based at least, likely bones as well)
Mobile render API (likely Vulkan, possibly Metal for iOS)
Android/iOS/WP ports
Occlussion culling
High level networking (replication, RPCs)
Effects/Particle editor
Terrain system
Visual GUI editor

And more to come after that:

Dynamic global illumination (+ other high fidelity graphical improvements)
AI (pathfinding, navmesh)
VR support
Cinematics editor
Visual shader editor
More specialized editor tools for 2D games
Script debugging
Level of detail
XBONE/PS4 ports
BSP brushes for level prototyping
Offline lightmapper
WebGL port
And more to be decided later...

Implementation times for each of those roughly ranges from 1-4 months.

Detailed task list