The first question is spoken French duplicating the third person pronoun.
It might have been written :
Et lui aussi est bilingue ?
(Someone is already bilingual,) is he (another guy) bilingual too ?
Your first alternative would need a comma:
Et aussi, il est bilingue ?
and has a different meaning :
And among other things, is he bilingual?
The second one should be reordered:
Et il est aussi bilingue ?
Here, the question is less precise and its meaning can be either of the previous ones, depending on the context.