There is no press release but the company posted information about product improvements on its website.

The router “uses the latest 802.11n wireless technology, so you can enjoy up to five times the Wi-Fi performance and up to twice the range of 802.11g wireless networks. And improvements in antenna design give you up to 50 per cent better performance and up to 25 per cent better range than with the previous-generation AirPort Extreme Base Station,” according to the site.

Source: The Register