It was hacked in very quickly for the April Fool's sneakypeek, and as folks have noticed, the code isn't as polished as we usually want to see. (It only works on the primary screen of a multi-monitor setup, for instance.)
We've definitely noticed how strongly folks are responding to it, so we'll keep this in mind as we work on future versions of the app. We're not going to ship with it in place, though.
For the time being, folks are welcome to use the sparkle peak build until it stops running in a few weeks. You can get it
here.