The markings you refer to are on stand 12. When this is in use it will preclude the use of stands 11 and 14. It can’t be used at the moment due to the ongoing works to the terminal extension. B777 B is a single designation used to refer to the B772LR and the B773ER necessary because both types have the same wider wingspan. A350-1 refers to the A350-1000. As far as I know there are no plans to have an airbridge to this stand but it is the least likely widebody stand to be used, the current main terminal widebody stands 2A, 4A and 10A are all served by airbridges. The new widebody stands 15, 16 and 18 will have airbridges in Place by late summer/autumn and are all capable of taking aircraft up to 777/747 size with stand 16 being wide enough to accommodate an A380.