Both the video and slides for Walter’s keynote at DConf 2013 are now available online. I haven’t looked at it yet, but some people have had some issues. Some pdf versions of the slides have also been posted. Follow the newsgroup announcement for more info.
EDIT: Might as well embed it here since it’s up at YouTube.
This was very recently put up on Youtube. Walter is explaining features of the D Programming Language. It’s a great introduction for newcomers.