Regarding this update, I suppose it's nice if you have all new devices running 802.11n. If you have any 802.11g (or god forbid, 802.11b) devices, it sounds like there's no reason to run out and replace your existing Airport Express:
Too bad, though I kinda figured it would be this way, since that's how it is with combined 802.11g and b. For people like me, who only have one wifi device that's 802.11g (original MacBook), there's no reason to upgrade their Express. If/when we get a new MacBook with 802.11n, it sounds like it'd be smarter to run two simultaneous networks at that time - one for the faster 802.11n machine, and one for all others. Rather than replacing my existing Express, I'd just get another one.