I believe it's code named "hammer"?
Sorry that my reply is so tardy, but I've been away and haven't gotten a chance to revisit this post.
It is actually "Clawhammer", according to PCWorld.
Yes, previous 64-bit CPUs have existed, but this will be the first one targeted towards consumers.
As of right now, they are on sale everywhere and they lead the charts. Many claim they already beat the highest end Dual 64-bit from IBM. Or, in other words the G5 even though Apple had nothing to do with the CPU.
Costco even sells them.