When the world was going Java, and SAP was rebuilding their apps on AS Java, the CRM team built the IPC for CRM within AS Java, which became known as CRM Java. This was problematic because it might mean you needed a HA/DR cluster of AS Java, just to do pricing. This was not popular, but by this time a lot of customers had written custom pricing routines in Java.
Since pricing was a few simple classes of Java and hardly needed a J2EE stack, SAP moved IPC into a VM container within ABAP as of CRM 5.0 (2005). This allowed customers to migrate custom pricing routines without having to rewrite them in ABAP, and saved SAP some development cost of rewriting IPC too. It made HA/DR much easier, since the Java VMC for IPC exists as part of AS ABAP.
This isn't changed for CRM on HANA and so it will operate the same way as on a traditional RDBMS. However, the IPC calculations will still run in the Java VM of the ABAP system and not within the HANA DB, if that was your question. There is no logical way for SAP to push IPC into HANA, because IPC was written in Java, and HANA can't run Java.
One alternative is to run ERP on HANA and use ERP for pricing over the CRM Middleware. This would indeed use the HANA DB for as much as the ERP on HANA ABAP code has been optimized.
For CRM on HANA, I highly recommend CRM 7.0 EhP3.
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