Edit: Sadly it looks like they have either announced the countries incorrectly or have accidentally shown their hand early. They’ve updated the post, removing Canada and Australia and added the following apology :
We’re sorry for an earlier post that said we’re launching in more countries on 11/13, but stay tuned as we’re bringing Google Play to more countries all the time.
Who’s hoping they just tipped their hand early? – Thanks Phillip

We’ve gained a heap of extra content in the Google Play Store over the last 12 months, almost a year ago we got Google Books, earlier this year we saw Google Movie rentals arrive and just recently we got access to Devices, Magazines and Movie purchases. Now the GoogleTV, Google+ page has announced that as of the 13th of November owners of GoogleTV boxes in Australia, UK, Germany, France and Canada will be seeing Google Music and Movies.

Now, Google advised that Europeans would be getting access to Google Music on November 13th when the Nexus devices were announced last week, could this announcement this morning have been a slip up and a premature announcement that we too may be seeing Google Music on either the 13th of November or soon thereafter? I certainly hope so, with competing music services popping up from Microsoft and the already established iTunes store it’s hard to hold off purchasing digital music waiting on Google. Only time will tell, what do you think? Premature announcement or just a limited release to Google TV ahead of bigger plans down the track?

Source(s): Android Central, and GoogleTV +