There is no 64 bit server in development. If you want to run a server on a 64 bit operating system, you should either make a 32 bit chroot or install the IA32 binary compatability libraries. The way you go about either of these will vary based on the distribution you're running on.
This messiness is why I took the 64 bit operating system off of my server, and instead went with a 64 bit kernel and a 32 bit userland