How to access the 4.7 Administrator Status Page?
You posted this question almost exactly at the same time that a PR to merge in this feature was posted - see the last comment on the CRM-13823 issue.

I was part of the team that worked on this during the Colorado sprint.  The entity and APIs have been in place for months, and the 4.7 code all uses the new entity - but the status page, for the sake of easier development, was done in an extension, which the PR merges into core.