The seats are big but not that big. They pulled the ol' "everything looks bigger with a small woman for scale" trick. Look at the picture of the guy sitting in the seat facing away from the camera. It looks like he's leaning right in order to fit in the chair and they moved the camera to the ~4:00 position in order to make that not show. They might not be "true economy" small but these seats certainly aren't large.
A380s are 2-4-2 on the upper deck economy, 3-4-3 on the lower deck.
And it looks like the original floor plans for the 350-900 were 2-4-2 but all the floor plans I can find from airlines and booking sites are 3-3-3 (the odd premium economy looks to be 2-4-2 but not regular economy).
Interestingly enough that means they're 32'' pitch 16'' width, where most airlines run those 31'' 17''. So depending on your body size, one can be worse than the other...
A330s and A330NEOs are usually 2-4-2, though sometimes 3-3-3 in the cheapest LCCs. A350s are usually 3-3-3 in economy, with the cheapest LCCs going 3-4-3.
