With the new AR Plus 4 looking like its a Duratec, we will find out tomorrow hopefully, the likelihood of an aftermarket Cosworth throttle body kit for the GDI may no longer be on the horizon.
There does appear to be a Titan kit which makes sense as I believe they have helped develop the Zenos car engine, which also uses the GDI engine, although I haven't got any more details.
http://www.titan.uk.net/products/details/ford-gdiOnce we know more about the AR car it may be worth while doing a little more research as the Zenos GDI engine claims to develop 200hp with good torque characteristics and that would be enough for me.