Definitely interesting, but it seems problematic that you have four cores that can address only a total of 4GB of memory, e.g. 1GB per core. Might be limiting for a lot of server apps. In practice it might be worse, with the system only able to handle 2-3GB (that's been my experience with 32-bit, non-PAE Linux).
2 or even 4GB of RAM is sufficiant for many, many server tasks. I think a system based on that SoC is on par with the Pentium III Tualatin quad-processor systems build in 2001-2002. These system also had just 2 or 4 GB of RAM. But nevertheless served well.
here are a few more publicly announced Cortex-A licenses: Broadcom , NEC Electronics, NVIDIA, STM, Toshiba, Mindspeed Technologies, Freescale, Matsushita, Samsung, PMC-Sierra, Ziilabs.
Why are there no solutions like Tilera's 36 or 64 core products. Are ARM's per core licensing costs too high ? 32 bit address limitations ? There are a lot of multi-core non ARM product our there, Cavium Networks (MIPS), Netlogic (MIPS), Freescale (PPC), Azul (Java VM), Plurality ...
Up to 4GB RAM may be a limitation to support multiple VMs with sophisticated service. The power saving may come down to how many VMs that can be supported on a ARM based server vs that can be supported by a x86 based server.