Meson is self-described by its developers as a "project to create the best possible next-generation build system." Meson is written in Python 3 and is designed to be high-performance while still being easy-to-use.
Those wishing to play around with Meson or learn more can find its code on GitHub along with the project site.
Meson is being brought up this weekend as its developers experimented with building Mesa 3D using Meson. The information about Meson building Mesa was shared on the Mesa-dev list. Mesa was targeted by Meson developers as being a real-world, complex code-base and "it seemed like an interesting challenge as it has lots of code generation and other unorthodox stuff."
The build time was shorter with Meson compared to Mesa's SCons support while the no-op build time was significantly better with 4.7 seconds for SCons while just 0.04 seconds for Meson. The results seem impressive and it will be interesting to see how other developers respond to Meson versus other build systems.