Find it all here. We've got a bit of Keep on the Shadowfell, a pair of the warlord's at-will powers, a trio of traps, and a PDF of orcs. Oh, and a blurb on the sequel to Shadowfell which appears to be based around a neat idea swiped from Ptolus. ;)
I haven't had my view of 4e shattered by any of this, and I've had a few of my assumptions confirmed. Nothing horribly earthshattering, all-in-all, but if you're one of those who has been sitting on the fence, wondering if you should or shouldn't convert your game to 4e, you might find the info and other links in the article very useful.