For those that are interested, Texas Instruments just announced their OMAP 4xxx which will feature multiple cortex a9 cores. They are putting volume availability at H2 2010, reinforcing the notion we won't see any A9 parts until 2010. For what it's worth, they also mention 45nm versions of the omap 3xxx series (the pre uses the 34xx, a 65nm version). They claim 25% power savings and 75% better graphics with these new chips.
So, seeing 45nm A8 parts from apple this summer could definitely happen, and they would have one leg up on the pre when it comes to battery life.
http://www.eetimes.com/rss/showArticle.jhtml?articleID=214200173&pgno=1