Groupon is changing. It is now proposing more flexible service for companies.  The commercial states:

• You can start a special whenever you want (for example, you have free tables or low season).
• You can end a special whenever you feel it is time to. 

Sounds much better than daily deals when you had to wait for your "big coupon day" and be overwhelmed with customer visits. 

On the user site the app looks like a mixture of Foursquare Specials and Google Wallet payment procedure. See a variety of mobile apps they are proposing.