MP is still using the same pseudopotentials as previously stated for its standard GGA calculations. We are now also running new calculations with PBE 5.4 for meta-GGAs, but these are not compatible with our current calculations. All calculations on the website are currently GGA.
As previously, if we switch, it will be communicated clearly both in the documentation and the database release notes (and will likely have an associated publication) since this would be a substantial change.