FWIW, I reckon they will go for a seat plan a bit like QF, with a higher WT+ capacity.
I will be disappointed if they opt for 2-3-2 on the UD - 2-2-2 works well and the aisles were wide enough on QF for us to actually wheel our pushchair down the aircraft, which was a first.
Initial (proper) routes have already been guessed on FT and HKG, LAX and JNB seem favourities.
Is ages away though - you don't all really believe they'll be here in a year do you!