#alpinelinux will drop linux-hardened because KPTI is not easily adjusted for PaX (by us anyway).
linux-vanilla will be upgraded to 4.14.13 which is non-LTS, but has a proper KPTI implementation instead of KAISER (which is hanging on several people's systems)
the linux-hardened -> linux-vanilla transition will be done in 3.5/3.6/3.7 as well, all to linux kernel 4.14.13, after some vetting is done in edge.
whether linux-{grsec,hardened} is removed in entirety from the releases is still being decided.
upgrading to linux-vanilla 4.14.13 when it hits the release repos is strongly encouraged, given the severity of the meltdown and spectre bugs