Amazingly, it's not really a crack. It's a leak for a master key, meaning it was created for a reason, which is generating HDCP keys and licenses and everything. You can find it using The Google (like hell I'm linking to it here), and using this key to create your own HDCP codes will be met with frustration and you'll find out it doesn't actually have full functionality, since it would be "capturing the content as it is being transmitted in real-time to a display."
Then again, nobody really cares because people have been pirating HD content, HDCP secured or not since the beginning of HDCP anyway. Though it's pretty amazing to see it's still not cracked yet, a few years in AND this was a leak so technically it doesn't count. Gaming DRM should learn from this (NO NO NO WAIT).

HDCP is as useless as DRM has always been. It's been cracked for real anyway.

The only reason HDCP hasn't been cracked up to now is because it wasn't a particularly high-value target. The actual spec is quite weak in terms of security, with it being possible to calculate a master key given 50-60 individual device keys (and while that cnet article calls this release a leak, the other sources I've read indicate the release was done anonymously, without any information on what method was used to obtain the key). HDCP wasn't a high-value target because capturing an HD stream is a breathtakingly inefficient method of copying HD content, and given that AACS has been cracked for quite some time (with Blu-Ray discs copyable with just a few clicks as a result) there's really no value in cracking HDCP for simply copying content. The only thing that will come of this is that people will be able to build devices (monitors, capture cards, etc) that can be used to play HD content without paying Intel their pound of flesh and accepting their various restrictions. In short, you won't see much (if any) additional piracy resulting from the release of this key, although you might just see people with fancy home-theater setups being less annoyed by all the bullshit that HDCP previously put them through.