New vc and Mercurial (hg)?

[FKtPp]

On Thu, Nov 01, 2007 at 06:16:03PM -0500, skip at pobox.com wrote:
> It appears there is some support in the new vc for Mercurial (hg).
> When I visit a file I see a mercurial library is loaded.  Alas,
> ediff commands seem not to work (e.g. ediff-revision claims the file
> I'm visiting isn't under version control).  Are these problems
> known?

And if I 'C-x v v' on a already up to date vc-hg version controled
file, I will be prompt to create a rcs subdirectory....

Is this a bug?