Time. I saw the HP Envy on Linus' Tech-tips review and the battery life on AMD CPUs is ridiculous. 14 hours on battery. For most people, you might be able to bring your laptop to work WITHOUT a power brick.
I'm personally not a fan of HP laptops, but i'm looking forward to AMD CPUs on thinkpad and Dell XPS laptops. There is no way there isn't going to be a X1 type laptop with an AMD CPU. Lenovo can't leave that kind of battery performance on the table without losing market share to Dell and HP.