The 787-8 Dreamliner will carry 210 - 250 passengers on routes of 8,000 to 8,500 nautical miles (14,800 to 15,700 kilometers), while the 787-9 Dreamliner will carry 250 - 290 passengers on routes of 8,600 to 8,800 nautical miles (15,900 to 16,300 km). A third 787 family member, the 787-3 Dreamliner, will accommodate 290 - 330 passengers and be optimized for routes of 3,000 to 3,500 nautical miles (5,550 to 6,500 km).

An open architecture will be at the heart of the 787's systems, which will be more simplified than today's airplanes and offer increased functionality. For example, the team is looking at incorporating health-monitoring systems that will allow the airplane to self-monitor and report maintenance requirements to ground-based computer systems.

In addition to bringing big-jet ranges to mid-size airplanes, the 787 will provide airlines with unmatched fuel efficiency, resulting in exceptional environmental performance. Passengers will also see improvements with the new airplane, from an interior environment with higher humidity to increased comfort and convenience.

Taken from Boeing website