Talking about books as “demand-weighted units” and telling customers they “encourage you to purchase …from one of our competitors” hasn’t played too well on the editorial pages for Amazon in their standoff with Hachette Book Group over terms, but on Wednesday the company floated a more positive story to change the narrative in the media. CEO Jeff Bezos will convene “a new device launch” in Seattle on June 18. A teaser video shows delighted people looking down at something they say is amazing, reaffirming longstanding rumors that Amazon has a 3-D cellphone on the way.