today at 5 pacific or tomorrow, depending on what you read.... but you can start reading the help and system requirements today
ArcGIS Pro 2.3 system requirements—ArcGIS Pro | ArcGIS Desktop
Check your "My Esri" for your local availability
https://community.esri.com/community/my-esri/blog/2019/01/22/my-esri-release-january-23rd-2019
And Kory's blog on "ideas" that were implemented is worth a read
https://community.esri.com/community/arcgis-ideas/blog/2019/01/17/ideas-in-arcgis-pro-23
Dan, this is exciting. Thanks for the info!