Just wondering, the news that a DR game for Wii is due for xmas came out before the news about the 4 download-able episode games. Can we now assume the Wii game will just be these 4 episodes put together as one game?

There isn't a Wii game, it was the Sun making up garbage. If there was, the BBC would say so, not just one rubbish newspaper.

I thought I read it on the DS News pages

You did Link to news page for wii game

It wasn't just the Sun who reported it.

http://www.mcvuk.com/news/37983/Doct...i-game-IS-real

As mentioned above, MCV (a respected Gaming industry trade magazine) confirmed that a Doctor Who Wii game is coming this year (they confirmed it via another source).
The BBC itself would have nothing to do with it, as it's a for profit enterprise handled by BBC Worldwide.....not the BBC.

The BBC can hype the PC game as it's free...they wouldn't be allowed to promote a retail game.
It seems likely the Wii game will be different.

The BBC aint confirmed it, and they would have said something by now. The Sun reported it because they heard about The Adventure Games and messed up with it, DS copied them and that over site is trying to get views.