I've just booked a ticket for CX J class, which I've not used before, for LHR-SYD and have a couple of questions:

Does CX allow advance seat selection?
Is it possible to find out whether the aircraft I'll use have the new seating configurations?
Is there anything else I should know in advance?

Sorry if this information has previously been shown here - I've done a search and can't find anything.

thanks.