Many users have been alerted to attempted logins to their accounts over several hours on 3 May. The attack was sustained with around 2,500 login failure per hour, being a magnitude higher than normal levels. A statement was made by email on 4 May: https://lists.wikimedia.org/pipermail/wikimedia-l/2018-May/090145.html
This task is to track publication of any analysis. Though some details might have security implications, there is plenty of published operational data from the event, along with several on-wiki discussions by concerned users. Explaining what analysis has been done and whether this may be prevented in the future does not have to compromise security. A report may even help to encourage long term users and those with trusted rights to enable two factor authentication on their accounts.