The first question is spoken French duplicating the third person pronoun.
It might have been written :

Et lui aussi est bilingue ?

i.e.

(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.