make your picture sharper, enhancing the image. Another new filter, "Sierra" has been added to the app along with a "simplified and improved design". You can now change your profile picture from within the profile page, and you can tap on push notifications to go right to the photo.
The 2.1 version of Instagram is now available in the App Store for those who wish to update, or for first time users to install. The app is free. Instagram's first update last September, increased processing time by 200 fold.
source: AppleAppStore via RedmondPie