How to get submodule information for a specific commit

Hi,

I'd like to get information about the submodule commits used by a
given super project commit.

The information I'm looking for is quite similar than the one you can
get with "git submodule status" but for any revs not only the current
head of the super project.

Someone on #git kindly suggested me to use git-ls-tree, but I'm
wondering if an option or a new command to git-submodule could be
added to achieve that.

Thanks
-- 
Francis