Qualcomm announced two 'Home Hub Platforms.' These are all-in-one chipsets that are pre-certified for Google Cast and Assistant, so manufacturers can make Assistant smart screens and other similar products with little effort. Rockchip has also announced a similar product.
Many were disappointed that the Chromebook Plus was using an ARM chip, but performance tests show it doing better than every other ARM chip used in a Chromebook to date. It seems this Rockchip OP1 chip is optimized for Chromebooks and that is why it performs so well.