I've seen this story this week. Seems bizarre. Sold a load of tickets to city fans for £50 a pop then 3 days before the game announce all tickets with a CF postcode will be cancelled and refunded- and anyone supporting city in the neutral end will be ejected.
Doesn't sound that neutral does it?
They clearly realise there's a lot riding on this for us, and have decided they don't want the whole of the stand to be City fans, raising the atmosphere for the away side.