Backend changes to Products & Services structure for semantic data
Many things become possible after this. Rich Pins, Order Confirmations, Invoices, Twitter Product Cards, etc.
The default email templates should be overhauled with inline CSS for responsive email. Then, insertion of schema microdata or JSON+LD
JSON+LD to all product details with the ability to pull product data from schema product types.
Just the beginning. Haven't even begin to touch on schema actions and potential actions or Action Status.