The new tower will be funded by the IAA, and latest talk is that it's to be finished some time in 2017. Nothing official has been announced as such, all just talk
afaik currently.
The DAA were asked by airlines not to build T2 where it is, for various reasons; more cul de sacs, too close to the threshold of 28/34, making an already complicated taxiway layout even worse, and they bulldozed 3 or 4 brand new gates to make it. The "H" pattern works just great at most major airports, but the DAA knows better.....