The eventual plan is to also completely re-build T3 also, plans I have seen indicate an extension of T2 further towards the runway and a new 'body' added for 'T3' or whatever the new incarnation will be called. I appriciate this isn't the best image in the world, but, it's the best I could get.
Not in this picture, but there will also be a pier heading north from the square of the new Terminal area.