Within DNN Groups, it would be great to do a couple of things.

1. Enable a group to sell things within the group. So for instance If I had a group for runners and I wanted to sell running shoes to the group, I could display a product list on the Group page only displaying products for that group.  I suppose Groups could potentially be treated like vendors and have the ability to enter and maintain their own products like you have in your dev road map. Question though, do you plan on having the ability to allow each vendor to specify their own payment gateway? Since groups are now actually "roles" maybe that can be leveraged?

2. Ability to have a Coupon/Gift certificates module that enables you to target coupons to the dnn journal for profiles and groups.