Interesting, I've seen no other mention of the RX 550, only the RX 560 that is expected. I have to admit, I'm surprised AMD hasn't released a card based on the full Polaris 10 chip. IIRC, the 460 was cut down. Maybe that will be the RX 560, but never can tell.
AMD took too long to get their GPU's into laptops, I ended up getting a ASUS laptop with a GTX 1060 3gb (which oddly enough isn't cut down like the desktop part, it's just half the memory of the 6gb version.). I was waiting for the RX 470 or 480 but Black Friday came along and I saved $400 on the laptop and AMD's had nothing to offer at the time...