In 2016, we made a pretty bold commitment to you: we would continue to support AMD Socket AM4 until 2020. It was a big promise, especially given what people were accustomed to with other platforms. In the four ensuing years, the humble Socket AM4 has been on an incredible trajectory: 4X more...
AMD has announced that its next-gen Ryzen 4000 CPUs based on the Zen 3 cores will be supported by X570 & B550 chipset based motherboards.
This is kind of a big deal. It's not the end of the world because it's likely that, just like with B350 and X370, some motherboard manufacturers will make it work, but I think the net/net is people that bought B450 boards expecting to go to Zen 3 may be disappointed
EDIT: AMD has reversed this decision and decided to enable motherboard manufacturers to upgrade 400-series motherboards to support Zen3. Details to be unveiled later.