That will be the airports 6th hotel. I think it will be located opposite the Ibis on open ground by the roundabout. I can remember when the airport had no hotels.
As for Luton remaining at number one spot for business jets I am always surprised how badly Stansted does when it is also open 24/7 and has good links to the capital.
It is always an eye opener looking at Google maps satellite images of all the London airports. Luton is jammed packed in every corner while all the other airports have room to spare with half empty business jet aprons.