As we head towards kick off in Japan, there remains a huge amount of intrigue regarding how this tournament will pan out.
With more teams than ever boasting a realistic shout of winning the whole thing, we asked two of rugby's pre-eminent thinkers to make their pre-tournament calls. Who's got their head screwed on?
Don't forget to get cracking on your own predictions for the tournament via the Guinness Pint Predictor. If you're on mobile, simply click the image below to download and play the game now.