I'm also wondering this. I don't use snapchat much, but from what the video showed in the article the "new snapchat" sounds exactly like the current snapchat. What am I missing here?
I guess that under the hood there are modes the camera can operate in - lower-res "video" mode and a high-res "still" mode. When you're looking at the viewfinder it's kind of a video - so it'll be lower res and presumably will skip some corrections involved when a still is taken.
Edit: oops I thought this was in reply to a comment where someone complained that the photo was taken from a screenshot of the viewfinder instead of using the camera functionality. Been a long day :-)
Where are you getting this from? Unless I missed something all they're doing is moving around the menus a bit.
My girlfriend noticed that she can use filters now. She has iPhone 4S. That may be related. I don't notice any other difference myself.
I think they replied to the wrong person, the story here is that the menus have changed.