Few reports today that its gonna be 65k, Leazes park and no overlap with SJP.
Design - something like Allianz arena in Munich, bubble-wrap design

Capacity just 13 thousand more to keep ?high demand?

My take - never liked these bubble like modern stadiums. There are ok somewher on outskirts of the city, but design wise dont take your breath away.
Cant believe that there are no better design than that.
But should see pictures first, though