The indoor directions are quite limited; they are available in select airports, malls, and other businesses in the U.S. and Japan. These are the complexes Google announced maps for last November.
As for the deals, they include both "now" and "later" deals - but only in the U.S..
Now, while you're viewing a map, you can pull up a list of offers nearby or see them plotted directly on your map. What's nice is that the integration includes both instant-use offers (digital coupons, basically) and advanced purchase offers (similar to Groupons).
One final addition? Those photo of businesses that Google's been collecting as part of its Google Business Photos program are not available via the app.