I believe Amazon does this every once in a while to gauge public interest in a particular title. If there are enough "pre-orders" they tell the manufacturer to give them incentive to actually produce the title. So the more interest there is, the more likely Amazon will be able to influence Warner, or whoever actually owns the DVD rights to L&C. If you have more than one email address, it would be good to sign up using all available addresses. Unfortunately, just because Amazon puts out this unofficial "poll" doesn't mean the manufacturer will actually ever produce the title.
