The reps on last MSI stream said that AMD themselves wanted motherboard makers to delay X300 launch. I haven't seen the video myself but there was a comment with excerpt of the video.
I'm going the same route as I don't need a dedicated GPU. I'll buy an ITX board when they're available and, if that happens before Raven Ridge is released, a Bristol Ridge APU to get by until RR comes out. Seeing AAA titles running at 30fps in 1080p with an A12-9800 APU makes me confident Raven Ridge will be way more than enough for my needs.I'm growing more interested in integrated graphics without the need of a dedicated GPU, so holding out on this Ryzen line for Raven Ridge. Hopefully the new APUs would perform at least as well as a RX 470.
Nevertheless, I'll give my support to Team Red by getting a A10 APU.