Work began last week on providing a purpose-built bus interchange alongside the Tramlink/Station at Elmers End.
The works are taking place as part of the project to expand the neighbouring Tesco (visible in the background of the first photo below) and posters within the supermarket indicate that the store and car park expansion is expected to be complete in October, which suggests that the transport infrastructure work should finish at a similar time.
At present, it is likely only route 54 (Elmers End to Woolwich, via Catford and Lewisham) which terminates nearby that will use the new facility. There are also currently no plans to replace the existing station footbridge (a move which would provide direct step free access between the Tramlink platform on the western side and the bus interchange on the eastern). The construction is obviously a step in the right direction, however.
Thanks to RP for both the photos and comments.