Re: NSW to dump UAI!
You are still ranked against NSW students only.
Students from each State are only ranked against their own State.
The difference is that ranks will be directly comparable between States - that is, 99.95 in NSW will mean exactly the same as 99.95 in Victoria, etc - and the rank will be called the same thing everywhere - as opposed to "Universities Admission Index" (UAI) in NSW and "Equivalent National Tertiary Entrance Rank" (ENTER) in Victoria.
Just wait for the official announcement guys, there's no need to fret.