The Pinterest app for both iPhone and iPad has just been updated to version 3.0. The only new feature is the ability to now swipe left and right between pins. The rest of the update concentrates on updating the look and feel of the app to match the design cues of iOS 7.
If you've become used to pinning items and interacting with all your Pinterest buddies, don't worry, the changes aren't so overwhelming that you'll need to relearn the app itself. Honestly, I don't see changes that are particularly noticeable with the design other than a flat navigation bar along the bottom. The gestures to swipe in and out of pins and menus are convenient though.
If you noticed anything I overlooked, let us know in the comments!