did i miss something? why have they changed teams in wc3l?

yes, you missed something. Basically the last month.

welcome in 2008

now now he is asking nicely....

Reply to Crills:
If I remember correcly, anyone can correct me if im wrong.
BET didn't had the financial backup anymore for the BET players. mTw did, so they contracted whO and Winners.
What is going to happen to FoV and co :P ... That is unconfirmed. (I think FoV is also going to army even if it hasnt mentioned before).

yes,true.
http://www.esl.eu/eu/wc3l/season13/player/2465217/
http://www.esl.eu/eu/wc3l/season13/player/2459779/

Two links from ESL for you to check.