VIA CoreFusion is a line of low power x86 processors manufactured by VIA starting in 2003.
The Corefusion integrates the Northbridge, graphics processing unit and a V-Link Interface (Luke and John only.)
The Corefusion Luke-Lite is nearly identical to the Luke, with the only difference being the integrated Northbridge is replaced with a VIA CN333.
Little is known about the Corefusion John, other than a VIA roadmap PDF from 2005 found here Archived 2012-06-12 at the Wayback Machine.
It is unknown if this part was ever released, but it likely would have used some variant of a VIA C7 core (since VIA lost licenses required to produce the C3 series.)