After the RB-57F (http://www.mach2.fr/rb57.htm and http://modelingmadness.com/scott/korean/preview/mach2/019preview.htm) Mach 2 (http://www.mach2.fr/avionsg.htm) is to release a 1/72nd General Dynamics WB57F Canberra (NASA) kit - ref.GP.063
Source: http://www.aviationmegastore.com/general-dynamics-wb57f-canberra-nasa-gp063-mach-2-gp063-scale-modelling/product/?shopid=LM545799cb78d2964af7209c241a&action=prodinfo&parent_id=212&art=129300
V.P.