I am placing my bets on a boy. The role of a male consort is not a happy one and the new Queen would have to propose marriage to her prospective husband.
In light of modern reproductive technology I am guessing steps have been taken to nix the Brit Parliament’s decree of equality. I may well be eating my hat, but I don’t think I am in any particular danger of that culinary disaster. Designer baby? Hey, why not. I wouldn’t want to put a girl into that position.