[Prophet in the wilderness]

Another thing, Boeing usually is conservative on their performance numbers when they build a plane, so ? when we actually see the 747-8I ( F ) or the 787, we might be pleasantly surprised.
Who knows ? they might be able to decrease enough weight to make the upper ( cafe, sleepers, computer lounge, business lounge, ) loft practical... if they can pull that off, that would be a really neat plane to fly in.

[Paleo Conservative]

Who knows ? they might be able to decrease enough weight to make the upper ( cafe, sleepers, computer lounge, business lounge, ) loft practical..

None of the airlines want that. What they seem to want is to move the galley and food carts up in that space to allow more room for seats. That would allow putting more seats on the main passenger deck increasing CASM even more. Instead of 467 seats, the 747-8 could hold maybe 479 to 487 seats in Boeing's standard configuration.