Hi Bhargava,
HANA is the latest upgrade in SAP, almost all modules has certain impacts due to HANA.
Coming to BW, you will have fast reporting features when it is using HANA. I recommend you to learn both BW in HANA and standard BW, which will give some open scope for job hunting.
Check with any vendor, see whether they are able to teach both or HANA with BW alone.
Regards
Terence