Wasn't this patch was reverted ?
Anyway it is a patch within MediaWiki software, which may be useful with some wikis outside Wikimedia. It i not a patch meant to be used on Wikimedia projects without discussions ab out how "superadmins" will be designated and without a policy about their nomination and permitted actions.
The patch is initially WITHOUT any user allowed (not even any existing default admin groups). I think that if it is integrated in Wikiemdia projects, they will include some existing administrator groups but there will be a need for discussing which groups to include in them; my opinionis that if they are implemented, all their actions will need to be coordinated by a common action approved by at least two or three admins in this group, which are also admins on distinct wikimedia projects; to avoid superabuse.
But without a policy, no one can be nominated for now (and I don't think that even the WMF staff should be member of this group, unless they are nominated by the community).
I don't see why you take this decision so fast when this has not even been deployed and this patch was even reverted !
There are tons of options in MediaWiki that are not used in Wikimedia projects but meant for other wikis (including wikis for closed proprietary projects).