It's a read only mirror, the read/write mirror is on bkbits.net. But we'll maintain the mirror (or you can, bk has fast-export which creates a perfect mirror in git).
Since the export process adds "bk: <changeset>" to the commit comment, it'll be easy to tell that it was created via your fast-export tool, which means my tool can easily point you back to the bitkeeper web interface.
https://www.bitkeeper.org/man/fast-export.html
But it doesn't look like there's any fast-import. Do you have some recommended way if I wanted to convert an existing repository to try BitKeeper out?