Re: What will the future development on SAP S/4 HANA on SAP HANA look like?

I assume you talk of custom or partner development.

Start by reading this comment from Björn Görke:

ay 29, 2015 9:30 PM

Then read the chapter about extensibility and the blog and whitepaper which is linked there:SAP S/4HANA Cookbook: What is SAP S/4HANA

Also, to use HANA XS, customer needs a full HANA license (not just a runtime license) in an on premise installation.

And yes, there is obviously a trend to move code to the database or frontend client, but as Björn mentioned, ABAP is not going away. My bet would be to get trained in all technologies.