Big "if" there and there is the added issue of the logistics and loss of gate space for the existing carriers while the construction happens - particularly the loss of two gates at T4. They could do it but it is going to be a mess while that happens. And those renderings show an enclosed walkway/terminal connecting the buildings. I don't believe they've broken ground yet so the prospect of having something completed in 12-16 months (summer 2010) seems low.