Unless TBI has changed its mind the idea was for 2 new aprons each the size of the east apron. The plan shows one apron with its entrance opposite the east apron with the second one opposite the short-term car park. Both would be fed via Taxiway Delta. Both are marked out for 6 stands each but then the north apron shows 3 stands and not 4. This would give the airport between 12 and 16 extra stands depending on what was parked there. The plan also shows the short-term car park as another apron with a further 6 stands and a terminal exension in front of it but then the airport would loose all parking in its central area.
If easy do base another 4 aircraft at Luton then this would push the airport into making the commitment for a new pier. Whatever happens they are going to have to build a new Immigration Hall as Immigration has been shouting loud about cramped conditions. The immigration hall is planned for the side of the new terminal fronting Taxiway Echo and can only be fed with passengers by extending the existing pier that fronts the old terminal. I have a hunch that the work will start in the next financial year so come April expect to see something happen.