New Google+ Changes (classic Google+ refers to the old version):
- the interface has a new simplistic interface
- profile is streamlined
- collections have a more prominent role
- you now 'follow' people; once you 'follow' someone you can then place them into a circle
- Google Hangouts is no longer in Google+ (check out its new location)
- with the new Google+, you can only create events using an Android device; switch back to the classic Google+ to create an event using the computer.
- pages is no longer a part of Google+
- you can no longer search within a community (super sad face)
- you can only delete a community from an Android device (switch back to the old Google+ for this feature)
- you can vote on a poll from the iOS app and computer, but can not create one. To create a poll use the Android app or switch back to the classic Google+
Check out this presentation to see the new changes in visual form.