From what limited info has been released, most of the losses occurred in areas where players pay on a metered basis with time cards, not with a monthly subscription. However, it is safe to assume given the magnitude of the subscription losses that there were substantial losses in monthly subscribers too.
Even the mighty Activision Blizzard noted that the f2p MMOs may be having an impact on WoW.
So with more f2p MMOs being launched in our own backyard over the next year or two, does this signal a tough road ahead for MMOs contemplating a monthly subscription model?