A Qt 5.4.1 branch is now available for changes targeted toward the release of 5.4.1. Current changes in 5.4 will be merged into the 5.4.1 branch on Friday, January 16.
Keränen Pasi has proposed incorporating the three.js scenegraph (third party) library into Qt 5.5. It uses the QtCanvas3D API for rendering. https://github.com/tronlec/three.js
Thiago Macieira has proposed upgrading the sources to use C++11 keywords: