From the Dropbox blog:
We thought about this from scratch and designed a solution we’re excited to share: connecting your personal Dropbox to your Dropbox for Business account. This’ll give you a personal Dropbox and a work Dropbox on all of your devices so you’ll never have to choose between them. It’ll be like having your house keys and your work keycard on the same keychain.
But this is about more than having two places for all your stuff. Take the mobile app — once you connect your Dropboxes, you’ll be able to get to both Dropbox folders from the same Files tab. Dropbox is also smart about making sure your stuff goes where it’s supposed to. For example, photos you add via Camera Upload will instantly show up in the Photos tab, but they’ll stay for your eyes only.
This is probably a smart choice considering that people tend to find a way to access their personal files on their work devices and vice versa, likely compromising the security standards required by IT departments in large businesses.
More interesting to me is the iOS 7 app update shown in the screenshots. I don’t know if Dropbox will manage to add the kind of functionality found in Boxie into the official client, but a new iOS 7 design and features (background fetch?) are needed.