This is an easy one.
1: Intel announce product, or in this case process.
2: IBM and AMD don't want to look too much behind Intel and announce the exact same thing before they would have announced it otherwise (probably in 6 months from now).
3: Intel release 45nm high-K process at the end of 2007.
4: IBM and AMD release 45nm High-K process 6-12 months after. No change there since process changes don't come this easily.
The cause for this might be either: 1: industrial spying. 2: that's just where research is now and both companies had to get there now both on a financial and a manufacturing point of view. 3; (most probably) a little bit of both.
But for today, IBM/AMD only had to announce it to look competitive with Intel. That's all.
Disclaimer :!: : This isn't a pro-Intel post
Intel would have done the same if the situation would have been reverse.