Livingstone wanted to take a rest, so he's going home after playing the World Cup and T10s.
I would hope that Foakes stays on with the main squad when the Lions fly home. Given the usual calamities that seem to happen on Ashes tours, he's got a good chance of playing, although knowing the selectors they'd go for Burns, Bracey or Smith instead.
And Cook is a far better bowler than Norwell. What a travesty of selection that is.