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There are two ways to look at this RFE.
Approach a) CICS TG passes Kerberoes tickets to CICS TS and CICS TS validates them. This approach requires changes in both CICS TG and CICS TS.
Approach b) CICS TG excepts the Kerberoes tickets via ECI/JCA API and sends it to RACF to map. Once authentication succeeds, it sends the normal ECI/JCArequest to CICS TS.
Could you provide some more information on whether you need to pass token to CICS TS? The RFE doesn't explicitly say that the mapping is required to be performed on CICS.