The only issue is that ARM is 32-bit and the 64-bit editions are not due till next year
before there are commercially available ARMv8-based SoCs with server-specific features, it does not make sense to utilize ARM chips inside machines used to host web-sites or run critical applications. Such 64-bit chips are projected to emerge in late 2013 at the earliest.
"ARM has some interesting advancements around power density. [...] I don’t believe customer are going to want to port their applications back to 32 bits from 64 bits,"