G'day Smokey.
Best bet re: M1A1 camo will be the same style as we currently paint the leopards - we haven't changed camo patterns for a while. The Green and Black are Federal Standard Colours, but the sand/brown is an Aussie develeped colour which can only be made by mixing. No doubt there will be modifications made to the vehicles when they hit our beach, as we have done for all vehicles we aquire.
This site has a some info on Aussie vehicles and colours.
http://www.mheaust.com.au/Aust/Austindex.htm
The ASLAV is not an LAV 25. Australia obtained a few LAV's from old Marine corp surplus, for testing purposes, but purchase order was for the Canadian version similar to their Grizzly, a wider and taller LAV vehicle. See this pic:
The wheels are also completely different (check out the comparison pic on the ASLAV pt 1 page on the full site page): http://anzacsteel.hobbyvista.com/armourframe.htm