The 787 has a different wing profile and swoop. It also has different cockpit layout. 50% of the fuselage is composite (as opposed to Duralumnin on Aluminum frame. It also has a different pressurization for increased comfort (lower altitude equivalent). The 787 is successful and wildly different than the 737. For those that dont know, each plane number (717,727,737,747,757,767,777,787) refers to the generation or platform, The 787 was Boeing's last complete start-from-scratch platform design. The 787 introduced many enhancements and is widely regarded as a success. It was hell-a expensive to design and certify ($30b). They made it wide-body (two aisles) for far flights (7000 nautical miles range). Boeing should have piggy backed on that redesign to make a narrow body, shorter range, version so it could fly into smaller regional airports, and operate with less crew. The composite are very expensive to manufacture, and their weight savings aren't necessarily a good fit here, as they are mostly used for moderate fuel savings at altitude which pays a lot of dividends as the plane flys on, but for short travel, its hardly worth the complexity in maintenance and expense in acquisition. Still, would have been a nice restart, rather than trying to keep the 737 alive for far longer than it should have just to keep pilots certified.