AMDs plans for 45nm deployment had not been solidly confirmed until just recently, with the announcement of the new Phenom II processors being due early next year. After the initial Phenom II's planned launch on January 8th, AMD will introduce six additional 45nm-based AM3 CPUs in February, all in the Phenom II line. It seems with the initial 45nm launch, AMD is going to be focusing on their flagship CPUs rather than the low-end CPUs.
Later down the road, in April, they'll introduce additional 45nm-based CPUs for the Athlon family. The chips will lack the L3 cache that other 45nm CPUs have and will likely be priced significantly lower than the Phenom IIs. The AM3 platform holds a lot of promise, so hopefully AMD can stick to their release schedule.