This is the brand new Profile Design HC Bottle. The HC stands for 'Horizontal Cage.' After years of bucking the BTA trend, Profile Design has seen the light. With the HC bottle, they've clearly embraced the notion that consumers want these types of products, and they're satisfying that demand with a really smart offering that is going to wow a lot of people.
The refill cap is a simple one-piece part. My only concern is that the hinge is just a thin piece of plastic which could potentially break at some point. A multi-part mechanical hinge might be more robust.