I'm very happy with these small updates. More memory is always nice to have. This was no doubt simply a matter of availability of higher density chips. 3G, on the other hand, is an entirely new hardware/software platform. That might take a while.
This is not as good a deal as some think. If you purchase the Student Teacher 2004 edition right now with 3 licenses, when you take advantage of the upgrade offer you will have 1 licensed 2008 edition.