What is it? Press This is a redesign of an existing feature with a focus on automation, speed, and mobile usability.
Source: WordPress › Press This Revamp Merge Proposal « Make WordPress Core
I’ve been working on Press This off and on for 290 days according to Github. (probably a little longer). Keep in mind, there was a bit of a pause in work.

It’s been quite the learning experience (which I’ll post a bunch about later).
Anyway, I’m super freaking proud to even get it far enough to be a merge candidate.
If you’ve never tried Press This (a WordPress posting tool), it’s pretty neat. The new one we just built is better in every way. Take it for a spin.
Seriously. It’s awesome.

Just a heads up, your “Take it for a spin” links to the graph screenshot.
Ha! Good catch.