That doesn't tell me anything. At best it just means "for this year" not "for all previous years". My tax guy said this:
"Yeah since there's no reporting coming into them from any outside source yet, there's really no way for them to even know anything about mining or bitcoins being bought and sold prior to this year."
Prior to March 25, 2014 does mean all years prior. However, you are correct about reporting. It's unlikely the IRS has much 2008-2013 information to bust people, but you never know. The NSA has a far reaching databank.
Personally, I've always reported all gains as ordinary income. Mostly because the law has always stated that all income needs to be reported, and I didn't want to have to go back once guidance was issued.