Like Civic with one engine option of 1.8 in Pakistan [ keeping turbo aside] , I think 1.8 will be only option with multiple trims for Corolla. A base , a mid level and a fully loaded.
I think Vios will come with 1.5 and 1.3 variants.
Global platform are flexible platforms as far as Corolla but it will cater for what is available internationally and It seems there will be no 1.3 and 1.6.
Also remember Toyota has killed the diesel for Corolla. And Hybrid is offered because the same platform with 1.8 and 2.0 hybrid is there under hatch and same platform.