They were officially announced on Monday, now it seems all users now have the new profile available to them. To check yours, just go to http://instagram.com/yourusername. Mine can be found here: http://instagram.com/ericburgess.
I like the new profiles, I like how visual they are. Since Instagram is meant to be a visual representation of your life, why not house all of your photos on a single landing page? The trick is, what exactly will they be used for? Instagram is an inherently mobile network. Will users begin to look at your photos now through the web? We’ll see, this could be some precursor to a larger Facebook integration that is to come later.