From what I've seen, Rivers will be a lottery pick and while 8-10 is somewhat likely, 8-15 is a far more accurate way to put his likely range.
Austin seems to be pegged as a combo guard - not big enough to be a true 2 and not pg enough to be a 1. There are several guys with similar skill sets to him -Waiters (more athletic), Lillard (more pg), and Jeremy Lamb (more upside, less effort).
Some teams are high on him while others do not see where he fits, so he sort of has a wide range of places he may go in the draft. I have not read a whole lot about his workouts, anyone got any details on that stuff?