The web UI hasn't changed much since the 7390, with extensive charts, stats and logs helping out should you run into problems. It can also flash for missed calls, unheard messages, and other DECT functions. An 'info' LED can be configured for different behaviours, including LAN/USB connection, if guest Wi-Fi is on or guests connect, if the Internet connection is active (despite already being a dedicated light for this) or if your Internet traffic quota is exhausted. It's wall mountable, and while it does have a decent smattering of informational LEDs, it doesn't have dedicated LAN activity indicators for each port - you'll have to hit the UI for that. It's certainly different to everything else on the market, and AVM looks set to follow that trend with an upcoming device looking somewhat like the Nintendo Wii.
The 7490 takes the same chassis as the 7390 - unfortunately cheap looking, and looking like a UFO in a retro-futurist illustration from the 60s.