There are cases and info that should not be shown to some users — arbiters need to have the ability to work on some case and disqualified for this case arbiter (due to be a party to the case, some bias or conflict of interest of a different kind) should not see the page.
There is "read" right — could it be limited for some pages (or even page space - it would be great)? If yes — then we would like to test it. If the right to read can be limited to an entire space, then we will need a role that has such a restriction for off-case arbitrators.
If this is not possible in a manner that we ourselves can reproduce then we will need to restrict the ability to read specific pages for specific users, I will write them, other arbitrators will confirm, in the future, we may need to repeat this operation in case of arbitrators withdrawal from specific cases.
If this is not possible at all, then we will need, apparently, the old extension for oversight rights (or some other mechanism) — so that we can hide part of the page and its content would no longer be available without visible additional actions (requiring the approval of other arbitrators). This will also require giving bureaucrats the power to appoint the role.
(This will prevent us from continuing to work on some things on the private wiki, but will fix some of our current problems.)