The SIMATIC MTP Integrator for WinCC Unified is available with TIA Portal V19, all details your can found on this page including ordering informations:
https://www.industry-mobile-support.siemens-info.com/en/article/detail/109827132
The new WinCC Unified Data Hub will be get a limited sales release with WinCC Unified V20. Detailed features for the possibility of a Central long-term database logging station for WinCC Unified, I will share in this community with release of V20.
For more infos regarding Module Type Package (MTP): www.siemen.com/mtp
as well as the entire overview: SIOS (SIMATIC Module Type Package (MTP) - Overview)
incl. application examples, latest release infos,...