findAndModify positional operator regression with undotted query fields

We are in the works of upgrading our server to 2.2.0, however we hit an issue with this: https://jira.mongodb.org/browse/SERVER-6588. It appears that this has already been fixed on 2.2 rc1 and according to your roadmap it will be available on 9/25. Is this for the Production version or the Development version? If it's for Production release, when is the soonest we could get the Dev version?