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If you think about it, any electrical device that responds to the user must use some amount of power. In most devices with displays, though, the display uses a huge amount of power, so an e-ink display that removes most of that power usage is wonderful. Yes, people want to believe that the battery will last forever without a page turn, but that just isn't feasible with electronics and batteries and such.
Since it does act as a keylock, it's possible that it is able to save a little power that way, though I'm not sure how much that is. It will also be able to run the CPU at a slower frequency, assuming that is possible. That is mentioned in a prior post.
I saw that in the next firmware version that you'll have the option to make it a full power off, which would be even better. At that point, where it would only power on in response to a single switch, you are at the absolute minimum power draw. Since you're still working with a circuit and batteries, it won't last forever even while turned off, but certainly as long as any other electronic device with batteries.
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