Details are defined here https://access.redhat.com/maven-repository

For this technology preview, there are a set of Maven repositories. You can choose between the general availability (GA) repository and the early-access repository (Alpha and Beta builds).

General availability repository: https://maven.repository.redhat.com/techpreview/all/
Early-access repository: https://maven.repository.redhat.com/earlyaccess/all/