According to multiple reports, Samsung is secretely preparing successor of Nexus One. Now, with the Samsung-made Google Nexus S confirmed as imminent in all but press release. A poster of Nexus S was displayed in a local Best Buy store in US by accident and, it was removed immediately. I expect release date will be no longer than end of this year.
Eric Schmidt teasing with the device. He mentions Nexus S @ 11:20~11:40 at Web2.0 Summit.



Here are some leaked specs by tech sites.
•Google Android v2.3 (Gingerbread)•4~4.5 inch flex Super AMOLED display with 480 x 800 resolution
•Multi-touch input, accelerometer, proximity sensor
•Swype for text input – NO slide out QWERTY keypad
•3G, (Probably 4G), and GPS supported
•Wi-Fi 802.11 b/g/n; DLNA
•Bluetooth and USB connections
•8 MP (3264×2448 pixel resolution) camera with built-in flash and auto-focus
•FM Radio and 3.5 mm audio jack
•Video recording in 720p Hi Definition @ 30 frames per second
Source:
http://www.pcworld.com/article/210460/the_nexus_s_and_google_everything_there_is_to_know.htmlhttp://www.electronista.com/articles/10/11/12/t.mobile.confirmed.as.the.major.carrier/http://androidandme.com/2010/11/news/best-buy-leaks-confirm-some-nexus-s-specs-and-t-mobile-support-suggest-in-stores-nov-14/http://www.engadget.com/2010/11/11/is-this-the-nexus-s/