[snipes]

I checked out a Breakthrough Q&A over at [url:cb8c1]http://www.computerandvideogames.com[/url:cb8c1] where they interviewed EA product manager Dave Rosen about the new expansion:

Will Breakthrough owners still be able to play those who don't own it online?

Rosen: For multiplayer online you can play against anyone who's running the basic Medal Of Honor: Allied Assault and/or Spearhead.
Breakthrough will be compatible with Spearhead, and of course you'll need the original Allied Assault to play it - but you don't need Spearhead to play it.


I'm not quite sure but I think that means that when you try and join a game in MP, it will show all the servers, from AA to SH to BT, and that you can join anyone of them.