Fortnum and Mason are opening a standalone store at T5 as well as a seafood/champagne bar, which will probably be the replacement for Caviar House.

Louis Vuitton are also opening a store in December.

The work the enable the changes started last September with the removal of the escalators from World Duty Free/Harrods and Reiss, Dixons and WH Smith being replaced with World of Whiskey and a duty free cigarettes store. This has allowed them to close the part of WDF where cigarettes and champagne were sold so refurbish the store and move the store somewhat out in to the walkway (there's a line drawn on the floor which shows where the store will come out to)

This in turn has meant that the main World Duty Free store has been moved back to allow a more direct and straight route through the concourse wothout going around the lifts.

The stores which are moving out in to the walkway at the southern end are just using up space where there is lower footfall.

IIRC the only stores still open at the southern end are Mappin and Webb, Dior, Gucci, Prada, Harrods souvenirs, Paul Smith and the new WHSmith store.

One big benefit of the works is that there will be a new "orientation area" which will move the departure boards and have a similar setup to the one after Security North, which moves the crowds and people staring at the boards out of the main walkway.