Now that you say that, i have to double check if it is Y and not Y+
From the photos, there are two rows photographed before a door behind the last row. According to the new A380 seat map, that means it can only be Y, not Y+. Moreover to that, the seats are in 2-4-2 layout (Y+ is 2-3-2).
So someone's just put the wrong kinds of blankets and pillows on the seats! Oh well, if it happens to you - score!
Having sat in the old 50A before, I'm only 172cm tall but I still find it a wee bit cramped for my liking. It's not completely limiting, but that said I've sat in 40A on a 4-class QF 747 and the leg room is great there (and that seat also has a solid bulkhead wall).
I can see the nice advantage of the 2-row Y in the rear (before the other 2.5 rows of Y behind it). If the "best legroom Y seats" are all taken, for a little privacy the UD Y may make for a nice choice (unless you don't take the possible increased turbulence very well). UD Y is also 2-4-2 compared to 3-4-3 on the main deck, which makes it a bit more friendly for couples (and singles, too, since you only have to climb over / be climbed over by 1 person, not 2).
So apart from possibly a bad curry attack incident across the entire aircraft, this new config may not be a complete disaster after all......