Lots of people saw this all coming, yet here we are 6 months away from it being fully operational and all we have is a bit of tarmac and some metal railings.
First improvement would be to remove the waiting rooms on the platform at Sandhills. At the cost of comfort for people using the station at other times, they take up too much space that is a premium
Then they could divide the platform with fencing, run that right up to the banister on the stairs accessing the platform. This effectively makes two, albeit narrow platforms that you can queue separately for.
Have marshalls/turnstiles at the bottom that limit the amount of people on the platform to avoid overcrowding
Run 8 carriage trains, plus they could hold 4 double trains on the third track south of the station, and again at the depot just to the north. That means they can very quickly get people on the move at the end of the match.
I've looked, the new trains have a capacity of 475 standing, but they would fit more at a squeeze. That's easy a thousand per double train.
All this is achievable in 6 months
Longer term there has to be another station built further south