No replacements are planned as Vista owners are instead encouraged to upgrade to Windows 7, 8, or 10. Support for PCMark 7 and 8 will continue even after the introduction of PCMark 10.
http://www.notebookcheck.net/FutureMark-dropping-support-for-3DMark-Vantage-and-PCMark-Vantage-next-month.209232.0.html