1) Volume discounts (Tier prices).
2) Built-in forum.
3) Time zone support.
4) Flexible tax support.
5) Allow customers to register/login by email or by username
6) Nested Master Pages.
7) More community-friendly (forums, news, blog, polls).
8) More admin reports.
9) Redesigned, user friendly administration checkout.
10) Allow store owner to select theme.
11) Supports all downloadable products formats (.zip, .rar etc).
12) Perfomance optimization.
13) Allow admin to disable or hide the rating system.
14) Manage URL rewriting from administration.
15) Several bug fixes and improvements.