The Wii U eShop will feature game demos in Japan. Nintendo's Japanese website features the first details on Nintendo's digital store and, as in the 3DS eShop, it seems you'll be able to try some games before you buy.
According to a report on Nintendo World Report, as with the 3DS digital shop, you'll also be able to rate games purchased through the store but this time you'll be able to check out Miiverse comments about a game before you make a purchase.
There are also videos but you can now watch these in HD on your TV.
The Wii U eShop is reported to have one exciting new feature though - the ability to download content while you're playing a game. Nice.