I would love a plot focused on post war scenario in which neo has merged with the AI and peace rains. But there is a human/machine sect which is hell bent on starting another war. Or the plot could focus on neo breaking the matrix beneath the matrix addressing the weak plot explanation of human batteries in matrix 123. Or the plot could run focus on neo 1 and how the whole cycle of killing of humans every few hundred years even started.
Honestly this is awesome, i just hope that keanu is still up for it. He does not look the same as he did 15 years ago.