KOB, I understand exactly what you are saying and where you're coming from, but I believe you will prove to be wrong at the time. I reckon Rennie has had Scott Johnson watching all contenders extremely closely and will have been in touch with him constantly. It has been reported that the Wallabies coaching staff have been putting together their two teams each week during the Super Rugby comp.
That being so, I will be as surprised as you (would be if any miss out), but for the opposite reason, if players from the RWC all get a call up to the first test squad if they are not in form. On that topic, the likes of Simmons, Dempsey, Beale, Hodge and DHP have not been in form and would likely be rated quite a bit behind others in their spots atm. I think there will need to be a very noticeable improvement from these players for them all to be in favour when Rennie takes over.