Google Related Searches coming back soon ?

I notice this new line in the Robots.txt of Google a few months ago :

Disallow: /relpage/

My first thought was Google will comeback with related searches or a clustering engine, but I was not sure enough, because Relpage is also used in some database query languages.
But now, with the screen shot taken two days ago and post today on the Marc Duval blog, we got the proof Google will comeback with it soon.