Not sure If I follow this. Do you want the new video to be included in game info page together with screenshots and trailer here?
Don't worry, i'll do a little PR for video here and there.
Tell you what. Record the rest levels, combine the footage with the previous one and include keywords into the name "Smintheus Beta Walkthrough". It will be efficient piece of work which would be easy to post, easy to market and share :)
Although I just need to see second part and that'll be enough. But we can make it better.