The Snapchat for iOS app has been updated to version 6.1 and includes some new features including one called "Replay". With this app turned on, users can see a Snapchat message that has already self-destructed. However, you're limited to using "Replay" on one Snapchat message per day, one time only.
The update also allows you to add information to your snaps including the time and temperature when you took the photo or video. You can even tack on to your disposable message, the speed that your device was traveling at when you took the snap. Besides three filters like Black and White, Sepia and Vintage, there are some other new features that have been added to the app with the new update, including a front-facing flash for night time selfies, and Snapchat users can designate up to seven people to be on their 'best friend' menu.. The new filters can be found at Settings > Additional Services > Manage.
source: Snapchat via AppleInsider