APO on HANA is nothing but SCM on HANA where SCM Application (SCM 7 Ehp 2 for HANA or EhP 3) can run on HANA as underlying database instead of other DBs like Oracle, SQL Server, DB2.
liveCache is a separate in-memory object-oriented database (MaxDB) used by APO which continues to remain as-is. SAP has announced liveCache can use HANA as underlying DB instead of MaxDB. However as of now there is no integrated SCM DB and liveCache on HANA as DB. That will happen in future but the amount of code refactoring including rewriting LCApps (C++ compiled routines for liveCache) into HANA Stored Procedures.
Regards,
Somnath