First off, this doesn’t appear to be Aperture 4, but nonetheless is a significant update.
Optimized for Retina Display
This is great for the lucky ones that are going to buy a new MacBookPro. I’m not one fo those. I have a very new MBP that will have to last me for a few more years. Having said that, I’m very curious to see how photos look. I expect it will be magnificent.