Back to the Future game for PC and Mac.
The insert lists a URL for redeeming the included code -- "121GIGAWATTS" -- which currently directs browsers to the the game's homepage. We contacted Telltale to find out when the episode will go live and were told that the timing has yet to be nailed down. "At the URL on the insert, people will be able to register for the free episode and will receive notification from Telltale Games when the episode is available to download," the developer clarified.
Also, if it wasn't obvious, the redemption code isn't unique, suggesting that the free episode will be available to the masses -- Telltale, when asked,