That's the concept he and Rich Oehler inititated and developed at Newisys before they both joined AMD earlier this year.
In brief, Horus is alive, it works and will hit the market very shortly in its current version which scales AMD64 to 32 sockets (64cores).
This will not be the end of Horus development, Phil said: Its next version is planned to scale way beyond this. However this version will depend on support of upcoming generations of AMD64. ยต