Well, im not sure where should these post go, becouse there is no Battle.net section, and thes einvolves lots of games, so for avoid double/triple/../.../hexa-post i will write it here.
It is not " officially " confirmed, but if you know the stuff Battle.net 2.0 involves, you should know that Battle.net 2.0 will integrate Facebook and other Social Networks.
So while they wont get in official terms, and nobody will say you will have to pay to play on Battle.net 2.0
You can deduce that you will, as in 9th Juny we will be forced to pay a 3,95€ fee to use Facebook.
Means 3,95€ may be the Battle.net Monthly fee.
These info. also reveals that Starcraft2, will be released adj. to Battle.net 2.0 in the next 6 months.
PD: none at FB said "these will be that way", but you know there are thousands of these reports all over iNet.
[ame=http://www.google.es/search?q=facebook+monthly+fee&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:es-ES:official&client=firefox-a] Check at Google [/ame]