I've already made my decision and I'm definitely getting ZombiU, but this is a great idea for people who are on the fence about purchasing this game.
For more obscure titles like this, when the consumer isn't really sure about what they're getting. I think the best thing the developer can do is release a demo.
For example, Nintendo wouldn't need to release a demo for New Super Mario Bros. U, but may need to release a demo for say, Pikmin 3. Obviously each and every series has its own fanbase, but utilising demos in this way is a very smart business move. It is also the best way of giving people who are unsure about a game/series a little taster of what's to expect in the full experience.