I thought the same thing and almost posted your exact comment, but if you click the second slide, it says:
"iCloud Photo Library helps you make the most of the space available on your iOS device, so you can spend more time shooting pictures and less time managing them. It can automatically keep the original high-resolution photos and videos in iCloud and leave behind lightweight versions that are perfectly sized for each device. You get 5GB of iCloud storage free, and other storage plans will start at $0.99 per month."
So it would appear that Apple is making a more seamless way to store and view all your photos on iCloud rather than on device, but is still charging you if you exceed 5GB worth.
"iCloud Photo Library helps you make the most of the space available on your iOS device, so you can spend more time shooting pictures and less time managing them. It can automatically keep the original high-resolution photos and videos in iCloud and leave behind lightweight versions that are perfectly sized for each device. You get 5GB of iCloud storage free, and other storage plans will start at $0.99 per month."
So it would appear that Apple is making a more seamless way to store and view all your photos on iCloud rather than on device, but is still charging you if you exceed 5GB worth.