It appears to consist of 3 things:
- realistic looking minifigs. Not square and not oversexed.
- additional brick colors, and not just pink.
- sets not based on movie tie-ins, but in real-world locations like an inventor's workshop, a café, an animal hospital and a beauty salon
These look like the perfect toys for young girls -- they encourage both creativity and role-playing. And as the latest science-based parenting books (Welcome to Your Child's Brain, etc) tell you, role-playing is the best way to develop self-control, which is the most valuable skill that can be imparted into a pre-schooler by a parent.
Sure, they're girly. So what? I want my girls to grow up proud to be girls, and aware that they can be whatever they want to be.
But to my mind, they seem better than most of the "boy" Lego sets out there, which appear to be much less repurposable, and are blatant commercial tie-ins or weapons of war.