John did not replace Hal. The events of GL 87 & 185 never happened.
John was not married to an alien (as far as we know).
His father, granny and I think another brother vanished. You saw a family photo of them in the original series but Secret Origins only showed his mother and sister.
We still don't know how many heroes know of the members outside of Hal. Some seem to know John & Hal & Guy.
Pretty much the origins of the others changed to where no one got a ring at the expense of another.