Upgrade Testing of BW SAP Netweaver 7.0 to 7.3

Hi,

Our client is upgrading BW server from SAP Netweaver 7.0 to Netweaver 7.3 and they want us to carry out pre and post upgrade testing.

Kindly share your thoughts on the areas where we need to focus on post upgrade testing. What are the changes that are going to be made available in SAP Netweaver 7.3 for BW. If there is any set of questionairre/checklist kindly share.

Thanks!!