I have that too but not sure what to make of it, also shouldnt that prompt the steam workshop to appear for EE?
I would like to be in that situation, too. But it doesn't appear under tools for me; there's still just the old editor.
Can't you right-click on it and install/play?
Yep. I was able to download, install and launch it. It asked where the game data was located, I figured I didn't want to mess around with anything until the official launch, so I closed it.