My take on the Pool:
Currently the pools is headed by:
AUS 9 Pts
WAL 9 Pts
ENG 6 Pts
And there's only 4 games left that will effect those 3 teams:
WAL v FIJ
ENG v AUS
WAL v AUS
ENG v URU
Even as a Welshman I can safely say England will get a bonus point (4+ tries) win over Uruguay, so that would leave the table as ENG 11, AUS 9, Wales 9 but with England only having one game to improve on that 11 Pts compared to Oz and Wales having 2.
Wales should beat Fiji with a bonus point, however it's a short turnaround between the tiring England win and Thursday's Fiji game, Wales have even more injury concerns and Fiji have upset Wales in world cups before, so it's not an easy game to call. I'm going to go for the bonus point win here even though I'm not confident that will happen, I'm not even confident we'll win at this point! However, If we lose then I can't see us beating Oz and this post will be a waste of typing with Oz & Eng going through.
So taking the easy (ish) games in to account, the table will probably be WAL+5, ENG+5:
WAL 14 Pts
ENG 11 Pts
AUS 9 Pts
With only these two massive games as a decider, note Oz have two chances to improve compared to ENG & Wales 1:
ENG v AUS
WAL v AUS
Which ignoring draws gives us the options below, excluding bonus points, max BPs in brackets:
AUS beat ENG & AUS beat WAL: AUS 17(19), WAL 14(16), ENG 11(13)
ENG beat AUS & AUS beat WAL: ENG 15(16), WAL 14(16), AUS 13(16)
AUS beat ENG & WAL beat AUS: WAL 18(19), AUS 13(14), ENG 11(13)
ENG beat AUS & WAL beat AUS: WAL 18(19), ENG 15(16), AUS 9(13)
Wales: Assuming Wales actually beat Fiji with the bonus point, if England lose to Oz then Wales are through. If England beat Oz and Wales lose it will likely be down to bonus points between Oz and Wales for runner up. Wales should have 1 already from Fiji with 1-2 possible when losing to Oz, Oz could get 1 for beating Wales and 1-2 losing to Eng... could be close and a possible scenario.
England: Unless Wales lose on Thursday, they have to beat Oz to go through. However, beating Oz even without a bonus point would almost guarantee progression - Oz would have to gain all 3 possible bonus points without England getting theirs to beat England's points (i.e: lose to England by less than seven WITHOUT England scoring 4 tries WHILE scoring 4 tries against BOTH England AND Wales). Even if Oz went all out for the tries, England could pick up 4 tries (think England France in the 6N) in retaliation, the BP win against Oz would ensure England are through to the QFs.
Australia: They look pretty comfortable, beat England and they're through. Only losing to both teams would definitely see them out. Losing to only England would mean a bonus point contest between them and Wales (see Wales above).