It doesn't take up room on the cape rack, have a new emote, have better stats, act as a requirement for trimmed completionist cape, or come with a hood to clutter up the bank. They are 100% cosmetic with nothing gained. I was worried about this update for ages, but I can't see a way that Jagex could have released it any better. Those capes seem like the best update since dungeoneering came out. I'm still not a fan of divination.