The V-280 is a third generation tilt rotor aircraft expected t tho be in service in 2020+. It is essentially an upgraded V-22. Though it does not have a ramp in the back, it has a lot of improvements over the Osprey. For example, both turboprop engines are attached by a single shaft that does not need a heavy gearbox in the center of the wings. This reduces weight and still allows the aircraft to fly even if one of the engines are lost or fail. Other improvements include the wide Black-Hawk style doors, highly maneuverable design, retractable landing gear, great fuel efficiency, speeds over 518 km/h or 280 knots, and a 15-man (plus or minus a few, depending on the situation) crew/passenger capacity. Also, different from the V-22, the engine does not rotate. Only the props rotate, which allows for greater stabilization during hover mode. There is also a larger prototype, comparable in capacity to the V-22, and a private jet in looks.
Here's some extra information: