Hi there,

Nice battleplan, you begin to know me, I always have suggestions

• Discount (coupon, order, product) functionnalities
  The discount is a very important functionnality in ecommerce, this is the principal way to make efficient marketing to make your store living. Today, ubercart has a lack of these functionnalities. There were some modules to bring discount with coupons, order... but there were bugged and are not maintained anymore, it could be great to add these feature in ubercart core
• Addresses in profile
  The idea above is very good, it would be excellent to consider the address like profile field, I don't know how. But it could bring more functionnalities to user to manage addressbook, and, in addition, it could make compatible a lot of modules that works on profile. I especially think about the excellent site user list module, and could bring, later, better and easier integration with CRM software like CiviCRM...
• VAT integration
  There are a lot of efforts and thread about that, but not ideal solutions today. I make some little module to make ubercart more 'european based store'. A lot of people (me included) can bring their opinion on that.