Some people have already been claiming bitcoin losses and gains before this. The issue is that bitcoin is so complex, even the IRS who is used to a lot of complexity, couldn't understand it. They ruled BitCoin to be currency, and now rule that bitcoin filings must be treated as property under the tax code. The IRS is just doing what it does, creating guidelines for filing. A lot of people have been waiting for clarification, so I guess it is beneficial to a lot of people.
Part of this could be dangerous for creating a loophole though. As the IRS has crypto-currencies defined, because BitCoins are legal means for campaign donations, some people with a keen eye point out that it could be used to exceed the $2500/$5000 donation limit.