That day had to come. It was just a matter of time. Debian bootstrapped new architecture port using just own tools and packages…
It was long trip. During last few years we saw bigger amount of work spent in Debian/Ubuntu on cross building packages. Then were Google Summer of Code projects on bootstrapping Debian and one for multiarch cross toolchains. And we had Wookey with his ideas, knowledge and abilities to get one thing to work on for months in a way that managers were agreeding that it needs another month and another ;)
And today I found an email from Wookey about AArch64 port. I suggest you to read it as it has a lot of information. You can find ready to use rootfs there which (connected with kernel from OpenEmbedded) boots to fresh Ubuntu 13.04:
Ubuntu Raring Ringtail (development branch) localhost ttyAMA0
localhost login: root
Last login: Thu Jan 1 00:07:37 UTC 1970 on ttyAMA0
Welcome to Ubuntu Raring Ringtail (development branch) (GNU/Linux 3.8.0 aarch64)
* Documentation: https://help.ubuntu.com/
root@localhost:~# uname -a
Linux localhost 3.8.0 #1 SMP Wed Feb 20 14:31:07 CET 2013 aarch64 aarch64 aarch64 GNU/Linux
You need to have patience as Upstart needs to run lot of stuff before it gives login prompt.
Still lot of work required as there are many patches to packaging waiting for being merged but I think that it is a big day for Debian and all distributions derived from it.