Considering Forza increased in position in Denmark and Ireland, was number one in Finland (the first next-gen game to do that), and had a scant 34% drop, yes, it's headed to big numbers.
A 34% drop in movie terms is monumental when a big blockbuster drops so low. In Japan, most major titles drop 50-60%, even Nintendo titles.
Basically, thats saying that if Forza did 100k its first week, the next week was 66k, which is an insane hold.
If Forza 2 has continued staying power, it should easily rocket past 1m in European sales alone. 2m is almost a sure bet at this point.
As for WoW. It totally implies it's name. It's amazing that an AMERICAN MMO such as WoW can be on the list - heck, Warcraft 3 expansions are on the list!