Second runway is simply an upgraded taxiway and will be used only if 05/23 is u/s. The 'new' runway is far too close to the existing track to be used in tandem.
This really is a very old story and has been thrashed out on PPRuNe several times in the past.
However, there have been whispers rumbling on for a few years about a PROPER second runway being built to the east of the field, with the new terminal complex slap bang in the middle.
It all makes sense but local residents are definitely anti in a big way. This really is many, many years off (I think!).
cheers SS