The new aarch64 chips will support large amounts of memory and hardware virtualization. Despite low performance, the perf/watt and high memory density might be good enough to compete with x86. These exist only as engineering samples and emulators right now.

All of the ARM server products in existence today are basically demos. Presumably the "select customers" offered HP "moonshot" and Dell "copper" are working on software ports and automation infrastructure for an aarch64 future.