Previewed at WWDC, launching in the fall.
Mac OS X x86 on Any PC?
According to the unconfirmed claims, any dependancy on the TPM digital rights chip have been "cracked" and specific hardware requirements can be worked around with emulation. These solutions can be slow, so the best solution recommended is simply choosing compatible hardware to start. (Recommendations are listed).
The supplied screenshot appears to have been pulled. Videos were also posted, but are presently unavailable due to server load.