Hi.
This is just a heads-up that you'll start seeing a "Page information" link in the sidebar (under "Toolbox") in the coming days on Wikimedia wikis. It is deployed now to a few wikis already. This "Page information" link leads to a newly reimplemented info action:
https://en.wikipedia.org/w/index.php?title=Main_Page&action=info
Many, many years ago, the info action was added to MediaWiki, but due to performance issues, it was quickly disabled by default and was mostly forgotten about. This year, with the wonderful help of Madman, Krenair, and others, we have reimplemented the info action to provide an information dashboard of sorts about a particular page title to users.
This dashboard includes a variety of metadata about the page, including the page's protection status, length, default categorization sort key, internal page ID, templates used on the page, and more. The content is somewhat dynamic: for some pages it will omit certain irrelevant fields and for some users (such as administrators), certain additional fields (such as the number of page watchers) will be displayed. This will slowly allow for the deprecation of outside tools that currently provide information of this nature.
The hope is that this action will evolve over time to become a valuable resource for users. If you can think of data points that are missing from the current action's output or have other ideas to improve the info action (it desperately needs a little design love), please feel free to e-mail this list or file a bug at https://bugzilla.wikimedia.org/.
MZMcBride