Concept art from the Valve artist Andrea Wicklund's Picasa portfolio was leaked Wednesday this week. They revealed concept art for Half-Life 2 EP3 from back in 2008. They've been since removed from the Picasa account, but check them out on the post by our friends The Lambda Generation.
In other Valve news, The Source Filmmaker software is now in Beta! Announced the same time the Meet The Pyro video was released, Source Filmmaker allows you to build levels into movies using the Source Engine; it includes features for animating, lighting, lip-syncing and more!
And finally, an announcement by Adult Swim speaks of a TF2 project coming down the pipe as a joint effort with Valve. Sign up for the Adult Swim newsletter to get yet another hat in TF2. Stay tuned to see what goes down July 4 (we think).