Kuba,
ArcGIS License Manager 10.5.1 fully supports concurrent use licensing for ArcGIS Pro. If you already have your Pro licenses loaded into the license manager they will carry over to the 10.5.1 LM when you upgrade in-place.
One key NEW feature with the ArcGIS Pro 2.0 install package is the addition of several new install properties for the package.
ArcGIS Pro 1.4.1 you only had one property (ALLUSES), with 2.0 you have the following:
msiexec /i ArcGISPro.msi ALLUSERS=1 ESRI_LICENSE_HOST=<license server> SOFTWARE_CLASS=BASIC AUTHORIZATION_TYPE=CONCURRENT_USE
So for the first time Enterprise deployments are practical.
Rich