Comet Lake-S is an upcoming Intel CPU series likely to offer variants such as the Core i5-10600K, i7-10700 and i9-10900. They are compatible with 400-series chipsets such as B460. These specs have apparently come up in a new leak posted to Weibo. It purports to show motherboards in the works at Lenovo, to be sold under the Legion brand.
Its images do indeed seem to show a board that integrates a B460; moreover, there is also one that may be associated with the 300-series, which would mean that at least 1 of these putative Lenovo Legion products may support Comet Lake processors.
The components - which inhabit a category the brand in question is yet to become established in - seem to exhibit features such as Wi-Fi modules and dual M.2 slots. Then again, this is a very preliminary indication of their actual existence: it may take far more than a couple of logos applied to some heatsinks to make a whole new line of motherboards, after all.