I flew on one of the aircraft recently. The seats are still "converter" seats; the middle seat has a table that folds down from the middle seat, and the armrests adjacent to the table can be pushed towards the table to make the aisle/window seats wider than when the same seats would be used for Euro Traveller seating. The seat pitch is marginally less than with the old seats -however; the seats are thinner, so the legroom feels the same. I believe the seat cushion width is the same as before.
One thing that is probably due to change should the trial be a success - the legroom on Row 1 - it's awesome, about 4ft !!!!!!