I am a little concerned that what has really happened is spending (4th AWD and other projects) has been deferred with bright promises for the future. IMHO the situation should be viewed with caution.
12 SSG's is a massive increase but ignores the fact we are a maritme nation with limited ability to protect trade. I would prefer to see 8 SSG and an increase in patrol and escort forces.
In addition to this concern, I have a few questions about the validity and accuracy of the 'leaked' information as well as the thought processes behind them.
The first thing which comes to mind, is that many or most of the mentioned replacement systems would not be expected to come 'online' until sometime around 2020, if not later. As such, the current Government would not be the one responsible for seeing such suggested systems enter into service, or even come up with methods to fund the various programmes.
To the idea of doubling the RAN SSK force... While a valuable capability potentially allowing the ADF to conduct distant intel and strike missions far from Australia, and also being able to threaten and help defend SLOC, I do not see the logic behind doubling the current force. Particularly if the RAN is currently having manning issues with just 6 subs, a more moderate increase to ~8 subs, assuming they can be properly manned seems more appropriate.
As for the notion of the Anzac follow-on frigate being destroyer-sized, BMD capable designs... I wonder how much of that is politics and/or sour grapes that the F100 design won as the AWD. From my understanding of how the programmes were to function, the AWD was to provide the 'high level' RAN surface fleet capability, and the Anzac follow-on design was to replace the Anzac frigates in the 'low level' role. It was speculated that whatever replaced the Anzac would be larger (possibly sharing the hull of the F100) and more capable than its predecessor (the Anzac) yet no usurp the area air defence role from the AWD. From the descriptions given, the vessel sounds like it is intended to be both larger and more capable than the AWD, even in air defence roles. That in turn makes me think that either some people are not satisfied with the selection of the Hobart-class as the AWD.
Lastly, with mention of replacing the Armidale PC with ~1,500 ton corvettes... I have to wonder how accurate is that statement. As has been generally indicated, the use of corvettes in and around Australia itself is of somewhat limited use, as most corvettes are of fairly limited range due to size, and the distances between different ports in Australia is already vast. That and that general assumption that a corvette usually have an armament comparable to but perhaps slightly weaker than that of a larger vessel like a frigate. This would be a far cry, and a huge increase when compared to the paltry 25 mm Bushmaster cannon aboard current Armidales. IMO what seems more likely, and would be a better choice, would be to purchase ~1,500 ton OPV(H)s in the roughly 80-95 m length range. This would give the RAN a patrol capability of most likely greater endurance, as well as greater operational area, than currently exists with the light and small, aluminum-hulled Armidates.
This to my mind would be more sensibile, particularly since an OPV is generally not considered a warship and also costs less than a warship typically.
-Cheers