I've yet to see the Yamaha in person. It sure is nice looking, but as you describe, sounds like a monster size wise. However, At 6'3", that might work for me. That's one reason I love the f6b, it fits me better than any other bike I've ridden even slightly better than my 1998 Valkyrie I once owned.
The new Yamaha is nice looking, and will appeal to those F6B riders that may have come from a "V-Twin" past, and miss the noise and vibration. It looks HUGE, and as stated above, is a heavy bike. It does have more storage, than the new Gold Wing. Personally, I will stick to the F6B. Faster, sleeker, lighter, and quieter!