I don't know if I'd qualify Dear Esther as a game. A ll your doing is navigating an environment. Its an amazingly pretty environment, at that, though. Its definitely worth the two hours or so it should take to 'play' it. Highly recommended.
I wasn't going to get Humble Bundle 8, but now I'm intrigued.
The new weekly deal is pay-what-you-want for Telltale Games: Back to the Future, Sam & Max Devil's Playhouse, Poker Night at the Inventory, Hector: Badge of Carnage!, Puzzle Agent 1 & 2, and Wallace & Gromit's Grand Adventure. Beat the average and get The Walking Dead.
I wouldn't worry too much about spoiling things. Besides if they have the game interact the seasons already passed we all know how things go already right? They may use the time old alternate character scenario.