According to 9to5Mac they are reporting new model numbers and claiming lower prices of Airport Extreme Base Stations and Time Capsules to arrive any day now.  I’ve checked the Apple Store and it still shows ships in 24 hours so no clues there.  It is thought that today will be the day these release, however I also wonder if it will coincide with a MacBook Air refresh which could feature 450Mbps wi-fi that’s been included in the new MacBook Pro’s and iMac’s.