A bit late but for any who missed it, QGIS 3.0 was released. 2.18 is still the Long Term Release that's recommended if you want stability. I've some stability issues in 3.0, particularly with the 3D view but still, a cool new toy to play with.
https://qgis.org/en/site/forusers/visualchangelog30/
http://blog.qgis.org/2018/02/23/qgis...a-is-released/