Have Microsoft responded to the 360 hackers?

Today many gamers, myself included, have been unable to access Xbox Live, due to some unscheduled downtime.

While there is no official reason at present why this is the case, in light of recent news stories concerning the Xbox 360 Firmware hack, many gamers now believe this downtime to somehow start the battle with the hackers, before it gets out of hand.
If so, this tactic of patching will be reminiscing of the PSP hacker battle that has been going on for around a year now, and shows no sign of stopping.

When Microsoft gives the official reason, we will have the news here first!