A customer would find it useful to include the product code or the full product description within the upsell window. For example if you have multiple products that start with the same product description but differentiate in size or colour you sometimes can't see this as the product description is cut off in the upsell window.
This feature would be extremely beneficial as in its current format it is only of use to view items with low character descriptions and does not go that extra mile to include product codes which would help.