What sort of publicity? Giveaways.
That's right. Giveaways.
When and what? Well, that's the interesting part. Here's the official breakdown.
Here's the cool part. What you actually have a chance to win each time is a full set of all four books. That's four chances to win the entire series so far (remember, there are more books planned for the series).
Then, after those four weeks of giveaways, you'll have a chance to win THE LAST SACRIFICE.
Why? Because the Robot Overlords may be overlords, but they are also kind of awesome.