So, after some digging, it would seem that the documents the pictures have come from is 100% true. But the Stadium design is early concept/place holder and nothing to actually base what the final design will look like.
Although, the plans for the size/dispersal rates & measurements/seating space & design are close to what we will see - dependent on what these feasibility studes show.
But the "outside" has still to be decided/released.
Which is a shame, because i personally really, really like that render.