The fleet market is so important to the big manufacturers that offering minor differences in specs/trims tailored to suit the market is going to be more and more common, even if some of the tweaks result in 'only' a couple of grams of CO2 savings in the (unrepresentative!) official tests
For reasons of tax and national insurance, my employer (a large FTSE100) has decided to stop offering access to any vehicles with over 75g/km CO2 on the company scheme from April 2017 onwards, which kinda rules out anything that isn't a plug in hybrid or full EV....so I'd expect most drivers that have taken something like the GTD previously will now be looking at the GTE instead