The public is wonderfully tolerant. It forgives everything except genius - Oscar Wilde
For new designs, it usually means about a year from tape-out to availability, but a lot can go wrong between now and then.
For server chips, you add a little time to that, but for chips going into existing platforms, you can shave a little off. Add in that the tape out probably happened a while ago, and it is just being released now for PR reasons, and you have a rough timeline for release.
In this case, the Q2/07 target looks a like a stretch, early Q3 is more of a safer bet. µ