UNDF has chosen the Tachyon family name for it's next generation n-Core engine. The first ship to deploy the new engine is expected to be the Advanced Rome 216A early in the next decade. The engine is listed as the Tachyon PM-01A n-Core though the name may change by the time it enters service.
The Advanced Rome will launch with a Proton RM-01GX2 e-Core engine. This will be an upgraded version of the existing RM-01GX.