Dangit. Disney is probably blocking whatever English-language playthroughs are available online, since the game officially will only be released worldwide on the 29th. But there must be leaks everywhere by now, so there's probably other people who have uploaded it.
Also, it looks like I was right about Scrooge's voice; it's not Kassir and not Tennant. IMDB says it's a Scottish actor named Enn Reitel this time.