Update: the Nikon P7800 is now in stock.
Nikon Coolpix P7800 hands-on video:
What others are saying:
"I criticized Canon for its disappointing G16 update to the G series, but Nikon's no innovation revelation either in this class. The Coolpix P7800, which sort of replaces the P7700 -- Nikon cameras never really discontinue, they just fade away -- offers just a few enhancements over the P7700, but doesn't seem to address that camera's real weaknesses." -C-Net
"Our first observation, however, was that there's no eye sensor, so when you want to use the viewfinder, you have to press the button, rather than just lifting it to your face as is the case with many. It's a minor foible, and at least the switch from rear display to viewfinder is fast, so you're not delayed once you punch that button." -Pocket-Lint
"We've been impressed with the image quality of these cameras before, but we've had issues with the performance of things such as autofocus and processing – hopefully things which will prove to have been improved once full production samples are available. [...] We're a little disappointed not to see integrated Wi-Fi and a touchscreen here, though it is nice that it remains articulating." -Techradar
Cosmetically, the most significant addition is a 921k-dot EVF, which Nikon reps feel justifies a jump in price, from $500 to $550. You'll also find a 1/1.7-inch 12.2MP BSI CMOS sensor, 7.1x 28-200mm f/2-4 lens and a 3-inch 921k-dot RGBW articulating LCD, which, like on the D7100, yields better clarity and contrast. There's 1080/30p video capture, an 8 fps continuous shooting mode (but only for six consecutive JPG frames) and an ISO range of 80-3200. Surprisingly, there's no built-in WiFi, but you can add on the $60 WU-1a for wireless connectivity. -Engadget