"These are processor designers - are they all makin' HDTV now?"
No. But it takes time to get even trivial changes to the logic out. And then, once a new core tapes out, it takes at least a year for it to enter production. For servers, it takes even longer to see any market acceptance.
So sure, all those designers are doing something. Adding 64 bit to a Dothan derivative is on their schedule, as is dual core, HyperThreading and whatever else they can think up. But that is going to take time. Unless Intel started on this last year, they aren't going to make 2005 with all three. I'll grant that HT and dual core probably were started last year if not earlier. But I doubt if any 64 bit capability, even Yamhill, was considered for Jonah last year.