Hi,

The repositories armv7h, i686 and x86_64 have linux-libre 4.20:

# pacman -sS ^linux-libre$
libre/linux-libre 4.20_gnu-1 (base base-openrc) [installed]
    The Linux-libre kernel and modules

Doing 'pacman -S linux-libre' also shows that the 4.20_gnu-1 version will be installed.

However the linux-libre PKGBUILD which is in libre only mention the 4.19-gnu version at the time of writing.