Now there's an announcement making this official 'IBM Software Support Services - service extension offers defect support for IBM z/OS V1.11 and V1.12 beyond the z/OS end-of-service date (ZS14-0025)'. It's a "fee-based corrective service to users who have not completed their migration to a newer z/OS release" for a period of 3 years. z/OS 1.11 is an exception as it gets only 2 years after the Lifecycle Extension period.
As for the content : "IBM Software Support Services - service extension provides corrective service (a fix, bypass, or restriction to a problem) for your z/OS V1.11 and V1.12 operating systems". The ordering pretty much resembles that of the Lifecycle Extension : "Service extension support for both V1.11 and V1.12 requires a minimum three-month purchase and offers flexibility in support of your individual migration plans, either for single machines or for machines configured within a Parallel Sysplex".