This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
Juno is last year's version of Eclipse, Kepler is this year's version. New versions of Eclipse come out around the end of June, beginning of July. And yes using the marketplace is the preferred way to get the latest m2e plugin.