SST has already been up and running in New Mexico for some time, and yes they are looking to put one in Australia. But this is not a replacement for the Space Fence. Radar and optical are complementary technologies that each have different advantages and disadvantages. They are not substitutes for each other.
The radar is an older C-band dish-type from Antigua that was once part of the SSN but stopped being used for space surveillance years ago:http://www.antiguaobserver.com/us-air-station-to-begin-dismantling-radar-next-year/It's not any way an "operational set". Both are going to be part of the SSN. SST is pretty sweet but the C-band dish is vastly inferior to any of the phased arrays or even the old Space Fence.
Yep, that's definitely some serious hardware
This paper talks a bit about how and why SST is so awesome, and also what some of the other options are for optical telescopes:http://www.amostech.com/TechnicalPapers/2013/Optical_Systems/ACKERMANN.pdf
The conclusion of the study was that the AF could buy a new telescope to put in Australia with much of the performance of the SST for the same cost it would take to move the SST from New Mexico to Australia. The end result would cost the same but you'd have two systems instead of one.
This is a radar I'd never heard of performing the satellite tracking mission