Wimbledon Station February 2019 Upgrade

When looking at the forum post regarding the bringing in of Class 442 trains I saw the below diagram given as a response by showing the SWR upgrades plan.

Are there any details of the plan for the Wimbledon station upgrade listed for February 2019 available in terms of what it is hoping to deliver and any expected disruption while it is being carried out please?

Thanks

https://forum.southwesternrailway.com/cfs-file/__key/communityserver-discussions-components-files/111/5722.Capture.JPG