I don't understand why an upgrade so soon was necessary. Most exchange customers are still on 2003 and 2007 is a big enough change as it is - admins and engineers need to totally relearn exchange for the 07 system.
Why couldn't this have been a .5 upgrade which expanded the current feature set (such as the better UI, expanded HA, expanded UM etc) of 07??? From the video it sounds like lots of improvements and fixes on 07, and not enough substance for another upgrade.
Don't get me wrong, I think the upgrade from 03 is more than necessary but a lot of customers would have only recently upgraded to 07 and now have to absorb another upgrade cost.
Not to mention the SBS/EBS customers - their upgrade was only released in November!