Who is starring in Narnia 4?

As The Chronicles of Narnia the silver chair is in very early pre- production,it is not confirmed to be made.Though peter dinklage (trumpkin),Ben Barnes (Caspian),Liam neeson (aslan),Will Poluter (eustace),Gary Sweet(lord drinian),and Laura brent(queen lilliandil)are all likely to reprise their roles,most large roles still remain uncast including Jill pole, puddleglum, and prince rillian