Guess it depends if Toyota is willing to offer an engine/gearbox combo package with LSD to Lotus.
Then it will be a 'regular' option on the price list for any car.
Any LSD unit that needs to be installed separately will most likely always be part of the Lotus-Motorsport parts offering. Aka. installed after the car has been finished and has come off the main production line and then driven to the Lotus Motorsport building for modification.