Today OpenSubDiv 3.0 left Alpha state.
** I got fooled, it hasn’t left Alpha state, and the post I read was generated today not created today 
anyways maybe good info for someone **
http://graphics.pixar.com/opensubdiv/docs/release_notes.html
Excerp.
General 3.x RoadMap
- Handle more primitives, but with fewer overheads:
- Reduce Compute kernel launches,which we will achieve using stencils instead of subdivision tables
- Provide back-ends for next-gen APIs (D3D12, Mantle, Metal, GL 5.x)
- Faster topology analysis
On the GPU side, the replacement of subdivision tables with stencils allows us to remove several bottlenecks in the Compute area that can yield as much as 4x faster interpolation on CUDA platforms.
New Source-Code Style
OpenSubdiv 3.0 replaces naming prefixes with C++ namespaces for all API layers
