Darren Murph writes:
"You heard right -- Google itself has just affirmed on its own social networking branch that Android 4.0 will begin to hit GSM / UMTS (sorry, Sprint users!) Nexus S devices over the coming month, with the luckiest few to get it today. Outside of that, there's no more specific time table to be had, but if you're able to suck it down in the coming hours, definitely sound off on the improvements in comments below."
Back in the end of 2009, the rumors were all about Google getting into the phone business. Previously Google offered what were called Android Developer Phones, starting with the HTC G1- the beginning of the Android Era. Then came the Original Nexus series starting with the Nexus One- introduced at the beginning of 2010. Nexus Devices are considered as Google's flagship Android products. The history of Android is directly linked with the Nexus series. Each Nexus device was introduced to showcase latest versions of Android. It shows the evolution of Android over the years and how the hardware Android runs on has changed and improved.Also they are the first Android devices to receive updates to the operating system. Let's see the Nexus Smartphone series- starting with the Nexus One to the newly announced Nexus 6.
Pocket-Lint: Google Nexus season is upon us. From October to January each year since Android began, Google has brought forth a one true mobile phone featuring Android, the whole Android and nothing but the Android, with no manufacturer-installed custom user interface on top.
Engadget - While many Nexus S owners are still hanging on for their bit of tooth-rot, folks in other places have already started receiving OTA Jelly Bean updates. If you can't wait, and if you own a GSM Nexus S (either I9020T or I9023), then you can find the full and official ROM file linked up at the XDA thread below.