After last upgrade (Wendsday 8th December) my site http://ur6lad.bitbucket.org/ return "404 not found".
Yesterday it works.
As I mentioned on the blog post, thanks for pointing this out. We put a temporary redirect in place:
your_login.bitbucket.org will redirect to bitbucket.org/hosted/your_login
We'll restore the true functionality ASAP.
This has been fixed.