I did not see this under XBLA but WSOP: Full House Pro is currently free (in US no idea about worldwide).
Also both Saints Row 1 DLC lead to dead links.
The 5 gum ad shows footage of the Micro Lab in the ad. It looks like a full arcade game to me. Since there was a Sour Patch Kids arcade game I wouldn't be surprised now if there were more products making arcade games.
As for Haunt being free, you do not need Kinect you just need to go through...