In the last few months theres been plenty of hype about expansion and future redevelopment of RAAF base Edinburgh. Does anyone know what for any why exactly.

The base no longer belongs to the RAAF, it still used by them along with civilian aircraft.

Its normal for people to kick up a fuss over increasing runway length. Firstly it means bringing in bigger and noisier aircraft. Most likely means more traffic over that area. Maybe they claiming more land or pushing the noise closer to suburbs.

Jacksonville airport, Florida have the same problems, nothing in it!

It's simply to upgrade the facilities, it's been in service since the 50's.

It's probably also because Edinburgh will be involved in phasing out the P-3 Orion and establishing it's replacement, the P-8 Poseidon.

I understand that they are increasing Edinburghs capacity whilst closing Parafield airport and transfeering all services there. The Parafield land will be sold of for future housing development.

Also lots of bunkers at RAAF Tindal, what's up there? one squadron of F-18s and at least 10 large bunkers in addition to the ammunition storage.

They are re-establishing the 7th Battalion and basing it at the base.
I believe it will be re-established by restructuring existing battalions around.
And yes, it is currently STILL a RAAF base.

There will be about 1,200 soldiers + their families, and over 350 vehicles. It will be a mechanized battalion.

They are basically going to expand the base with new facilities, some that will be jointly used by the Army and Air Force. Obviously there will be accomodation, as well as training facilities

It's basically part of defences/governments plan for a Hardened and Networked army. It has nothing to do with the replacement of the Orions. That's a seperate issue/matter all together.

Here's some images of what they intend to build.