Hi Guy,
I can take the question regarding ODBC/JDBC: this will soon be supported by SAP HANA Cloud Connector. You can then use on-premise DB or ETL tools and connect them via the cloud connector to the databases in the cloud.
Regarding the XS OData question: HANA XS supports OData exposure of HANA content out of the box. It is very easy to access content stored in HANA via OData/REST.
Best regards,
Timo