I assume you're referring to the new atrium shown in the photos in post #27? This is really the bulk of the upgrade, and I'm not sure what more you could ask for in this section. I'll quote one of the images from that post here:
There is huge signage on the lifts for platforms 7, 6 and 5. If you're after platforms 1-4 it's fairly obvious these will be found nearer platform 5 than platform 7, and indeed there is a smaller sign with these platform numbers above the exit that leads to these platforms (just visible in the centre right of this picture). There are departure boards for all platforms on the platform, and between the lifts there is a large display with departures for platforms 5-7.
While there is a clearly intended exit and entrance concourse, it is possible to change between any platforms on either concourse.