While a good idea, it's likely in the polishing stages for the first DLC pack. There are largely completed zones and story content at this point I'm sure. They will complete the DLC officially likely 2-3 weeks before it's launch and submit it to whoever to make sure it gets ready to be distributed on D-Day. This means the illuminati conspiracy guys that think Half Life 3 is confirmed will also claim that the first DLC pack had been finished all along and if they were shown DLC pack 2 content they would just claim they cut out content so they could show it. All in all though I'd still like to see the behind the scenes but I know it will do nothing to appease anyone.
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All good points and I suppose the December release window isn't too far away for the first DLC. I'd be surprised if they weren't still testing the second DLC though at the very list, and maybe they've saved some of the videos from prior QA testing that happened post-intial release?