I think the Airport Express might get an update quite soon possibly with a remote control or something.
But I can't see the Airport Extreme getting an update until wireless-N, is a standard and that won't be till late 2006, early 2007 from what I've seen.
However, it would be nice to see a built in ADSL modem in the Airport Extreme base station instead of 56k modem.
But I think there will be quite along wait before we get 108mbps wireless etc, as I think Apple will won't be one of the early adopters of wireless N and they will wait till wireless N is mainstream, which is a shame really considering they were one of the first companies to sell wireless equipment in 2000.