I'm being told that the decision has been made re: allocated seating and this will be announced before end of the month. Come the autumn you will all have a seat number on your boarding card.
As has been explained before. You get the opportunity to pay to choose your seat with a premium on the exit rows. For night before the flight departs passengers who have elected not to choose a seat are preallocated one. For those booked on the same booking reference, every effort will be made to allocate seats together. Given that even on a full flight with free seating only 3 or 4 people don't get to sit directly next to each other, so it won't be a case of everyone being sat apart...... that some are predicting.