I don’t know if Boeing has changed things, and the article was only speaking of "eye level", but in a May 2, 2005 Post I said -

If 8 across in coach, will CO have 2-4-2 or Boeing's suggested 3-2-3?

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I just ran across a special promotional section in the March 14, 2005 edition of Aviation Week. On 787 coach seating it said:

“Thus Boeing targeted an inside width of 205.6 in. at 50 in. above the floor, a number that makes the aircraft 14 in. wider than competition at seated eye level.
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Finally, the interior was designed to maximize the potential for passengers to have an empty seat next to them—a phenomenon that makes people perceive their seats are 4.25-in. wider than they really are, and this has a huge impact on customer comfort and satisfaction, says Klaus Brauer, Boeing Commercial Airplanes' director of passenger satisfaction and revenue. The mock-up of the eight abreast economy cabin shows a 3-2-3 seat arrangement that maximizes the use of empty seats. Airlines can opt for a 2-4-2 arrangement in the eight-abreast section, says Brauer, but at a load factor of 70%, there will be 12% more passengers seated next to empty seats in the 3-2-3 arrangement than in the 2-4-2 arrangement. The 787's nine-abreast economy-class cabin layout has 3-3-3 seating, which, says Brauer, is the most effective configuration in using empty seats.”