Looks like the change is already in effect as of USSW-0205/6. The new imprint is a single "M" as seen on the obi and disc here:
https://static.mercdn.net/item/detai...jpg?1570372574
I've marked 5pb. Records as succeeded by the MAGES. imprint:
https://vgmdb.net/org/26
Edit: It doesn't look like there will be a Games/Records imprint like with 5pb., so I marked the MAGES. imprint as the successor of 5pb. Games as well.