This post by Norris on the AUSTRAK forum indicates that there may be a new version of the RT45 produced and imported later in 2012, Not a lot of other info provided other than it would be cummins powered and updated,

Keep your fingers crossed. I’ve asked Norris for more info in the meantime checking the AUSTRAK forum regularly would be in order.

The concept of the AUSTRAK is brilliant and I’m sure sales would result at the right price.