I installed Visual Studio 2013 Release Candidate and after opening a project I noticed CodeLens information is not showing up.
In the preview versions you had to turn this on in the options menu, but I can't seem to find this option anymore.
Why doesn't this work?
On
You need Visual Studio 2013 Ultimate with Team Foundation Server 2013.
To use this feature you will need Visual Studio 2013 Preview and Team Foundation Server 2013 Preview as some information comes from TFS.
and:
Here's what you’ll need:
Visual Studio Ultimate 2013 to find references
Team Foundation Server 2013 to find changesets, code review requests, and different kinds of work items
This article will tell you the same.
You can download Team Foundation Server here.
The option is hidden in Tools -> Options -> Text Editor -> All Languages -> Code Information Indicators
The only one that appears to work for us is the references, even though all options are enabled.
Update: My missing options were answered here... VS 2013 CodeLens
Hope this helps.