Pardo mentioned that Blizzard is not looking to put Diablo 3 on a subscription-based pricing. “It’s clearly not an MMO, so it’s not appropriate to do a business model like that” Pardo answered.
Further in the interview the VP of game design went on to answer the question about Battle.net saying:
“With Battle.Net we’re definitely looking at possible different features that we might be able to do for additional money. We’re not talking about Hellgate: London or anything like that. We’re not going to tack things on.”
From the sounds of it, Blizzard is looking to charge the small things and keep the overall core of Battle.net free, which is definitely a plus. Based on this info, things like changing of servers, names, characters, etc. would all be charged and game play would remain free. If nothing else, this should take a load off gamers minds (and wallets).