Re the Aussie Citi cards, that's If they end up anywhere - Citi used to issue credit cards in the UK (Citicards) until sometime around the GFC, the cards were spun off all over the place. I think some went to SAV Credit, which issued a heap of random cards for a while (Aqua/Opus, etc.), so somewhere like Latitude wouldn't surprise me.
Not sure what happened to Citi's own branded cards in the end, but those like the AAdvantage ones were eventually wound up (MBNA issued a heap of airline cards including AAdvantage until around a few years ago, AA/VS/EY/EK/UA I believe, so they obviously ended up with that contract). Egg went to Barclaycard, some of the others (like easyJet's credit card) just disappeared.
Citibank itself still operates in the UK too, albeit only on a Citigold/Wealth level, but the US banks have been exiting Europe gradually (MBNA, which was originally owned Bank of America, is now owned by Lloyds in the UK, not sure about MBNA Canada).
Wonder what'll happen to QF Money.