Thinking lifting fuselage with wider cabin and stubbier swept wings- very thick wing root (in fact depth of fuselage)- all the room in the world for fuel, gear, systems, engines, and wider cabin. Think bigger Vulcan, with double or treble joined cylindrical fuselages (with vertical bracing disguised as aspidestra pots), and it's getting towards Boeings latest studies for next gen aeroplanes. Someone will have a picture of the latest model being glide tested (in the UK for some reason).
Found it!:
http://www.news.com/2300-11397_3-6207999.html Don't like engine location, but this has to be the shape for longrange, high capacity aircraft. Really, it's just a Vulcan jazzed up with better engines and a cabin. But to get a cabin that wide and flat, you need cylindrical fuselages side by side in a 'double bubble' or 'treble bubble' (hence the vertical bracing columns), no windows apart from a walkway at the front of the wing, and a very quiet bedroom for the Captain. It is the logical next step.