Instagram has also increased the size of the grid pictures on user profile pages, hashtag and location pages. That should make it easier to go through large collection of pictures. Additionally, the "load more" prompt has been replaced by infinite scrolling on many pages. Another change allows you to report individual comments as spam or abuse. And of course, the update includes the usual gang of bug fixes and performance enhancements.
Version 3.0 of Instagram is now available for free from both iTunes and the Google Play Store.
source: Instagram via AndroidCentral
New Instagram feature Photo Maps (L), updated profile page with larger photo grids (C), and new photo upload screen