(Spoilers) so what happens with the main couple?, etc

Two things I'm confused by in this rather bad movie:
The main leads make it through the fight at the wedding otherwise unscathed: Joker does not go on to become Wukong, and Zixia survives with him. What happens to them then? Are they yet ANOTHER incarnation of the two, or do they get memory-wiped and become the two coupled at the end of Part Two?

And who were they anyway? Were they the two from the end of Part Two? If so, how does that Zixia know about the future and how does she have pandora's box? Or was it the two from the start of Part Two, namely the 'real' Joker when he first meets Zixia, and if so, why were they a fresh couple? It's like they combined the end-of-P2 Joker with the start-of-P2 Zixia for P3?