Well, you're in luck, two fold!
a) I've done the research you couldn't be bothered to (google is so complicated, I know), to find out that there has indeed been an indication of minimum speeds!
a) as pointed out
here, satellite and wireless are expected to be 12mbps (at peak usage, so a 'real' 12mbps). I've read a more authoratitive source than that, but I couldn't be bothered doing more research for you. Oh, and finally - I also read somewhere that optical will be cross subsidising satellite and wireless to the extent that Australia wide, you will be paying the same cost for xGB downloads on a 12mbit plan. The only difference between wireless & satellite is that higher bandwidth plans won't be available.