The blog post (https://www.dropbox.com/developers/blog/82/dropbox-2048-save...) links to it. Here's the direct link to see your datastores: https://www.dropbox.com/developers/apps/datastores.
Interesting to note that the datastore isn't really deleted when one revokes Dropbox access to the app, even though it's no longer listed on the datastores page - relinking the app to Dropbox resurrects the previous data.