Some extra comments on the layout above.

It's a
32 CW / 32 WTP / 360 WT seats, compared to the current 2 main LGW versions:
40 CW / 24 WTP / 219 WT and
48 CW / 24 WTP / 203 WT

The LGW aircraft with First is
14 F/ 48 CW / 40 WTP / 124 WT

So a huge uplift in WT seats, and quite a big increase for WTP too, while maintaining the higher level of CW seating . So a lot more people on board. I'm guess they've taken out some of the 1L and 2L galley space to get this to work for CW. For WT it strikes me that the very rear of the aircraft may well be the place to be now, which is admittedly the case now.