Aug 7, 2013
This should be a nice little feature. Have been checking my GWT and seeing only a notice: "Google has not yet processed your site. Be sure to check all site variants.
Here is Webmaster Tools help section on Mobile Usability

Tracking mobile usability in Webmaster Tools

Mobile is growing at a fantastic pace - in usage, not just in screen size. To keep you informed of issues mobile users might be seeing across your website, we've added the Mobile Usability feature to Webmaster Tools.

The new feature shows mobile usability issues we?ve identified across your website, complete with graphs over time so that you see the progress that you've made.

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