So seat selection has reappeared again, and nothing has changed (phew! still a 777) except that now there are 2 rows of works deluxe seats that have come available. I'm tempted to select them but I'm afraid that if I do, and enough passengers purchase works deluxe fares before the flight, then I may be bumped onto somewhere random in Y. Would the middle seat even be blocked for me anyway if I selected those WD seats? (I'm on a works fare). Perhaps I'll wait until just before the flight to see what the seats are doing.