We've head a chance to see Deneb, 45nm K10.5 with 6MB L3 cache and we can confirm that this CPU overclocks well. We've seen close to 4GHz overclocked part with AMD stock cooler on air and if you use water you will get over that milestone.
With LN2 you will get even higher than 5GHz and it will run stable in any of these circumstances.
We will get you more details soon, but I've just wanted to share with you guys that Deneb exists and a few people could see and play with it at the Austin, Texas Lone star campus. Stay tuned for more.