Sounds like they are also looking into regulating exchanges, since they're pretty much the only companies operating with virtual currencies at this point. It's also interesting how the central bank would be doing the refereeing. Would they be fair?
So the reason for the regulation, basically, is that they fear that a fraction of the remittance by their overseas workers will be done through Bitcoins to avoid the proposed US taxes. Not being able to tax that fraction would be a blow to their economy. I guess it's a legitimate concern since Bitcoin can, and is being used to dance around regulations and taxes.