Have you updated your Google+ to the latest design interface?
The new cover image is a whopping 2120px by 1192px when fully expanded, and will reduce in size automatically based on browser size. Example on Quantum's Google+ page.
- A new tab for your Local reviews.
- An easier way to edit your info. The 'About' tab now consists of separate cards (like Story, Places, and Links).
Everything's rolling out gradually, so keep checking if you don't see it yet.
