Originally Posted by BKayrac
i think your problem with receiving updates with the nexus phones is your using the carrier versions
"Google will be pushing out Jelly Bean to the Google Nexus S, the Samsung Galaxy Nexus and the Motorola Xoom by mid-July. The software development kit will be available for developers starting immediately."
notice the nexus s will get it right away assuming your using the true google nexus s
notice those are all the true nexus devices, not the carrier versions..........the gnex buying outright is 350$ right now, and you actually get updates strait from google, where as with the s3, you'll be waiting
But I'm not - I bought my Nexus S sim free from the Carphone Warehouse because it wasn't available through my Carrier (Three UK) at the time.
This worked out for me as I u/g through my carrier, gave the phone to my wife and put her on a sim-only contract leaving my contract unchanged, but with a sim-free Nexus S.
Whether it is the carriers fault is another matter, but it is not a carrier supplied Nexus S.
 Found the reasoning for the delay...
Rumor: Nexus S Ice Cream Sandwich update restarting soon - 16-03-2012
Originally Posted by Android Community 16-03-2012
Rumor: Nexus S Ice Cream Sandwich update restarting soon
We got quite a response when we noted that owners of the Samsung Nexus S were more than a little upset that the official Ice Cream Sandwich update was months overdue. Now Engadget claims an anonymous source saying that Google intends to sestart the long overdue OTA software process in “the next few weeks”. Take it for what it’s worth (and without a confirmed cource, it isn’t worth much) but it’s at lest a ray of hope that those who paid for Nexus hardware and timely software will finally get their money’s worth.
As noted above, owners of the Nexus S and Nexus S 4G have been frustrated with Google and Samsung’s glacier-paced response to their complaints. The official Ice Cream Sandwich update began in December for GSM models, but was halted almost immediately for more bug fixing. Three months later, the vast majority of Nexus S owners (and all Nexus S 4G owners) are without an official upgrade path to the latest version of Ice Cream Sandwich, a feature promised to them when they bought the phone, unlike other models that are already seeing updates.
There’s always the option of rooting the phone and installing a custom ROM, and indeed, many do just that to take advantage of the Nexus’ large developer community. But they shouldn’t have to: as a developer phone, any device with the Nexus label is supposed to get updates “as fast as humanly possible”. Between this slow response for the Nexus S and a seemingly lowered level of support for CDMA devices like Verizon’s Galaxy Nexus and XOOM, previously high levels of excitement for the Nexus program are steadily dwindling among Android enthusiasts.
I might hang out until the end of the month to see if I get the JellyBean update on my Nexus S. Once I have played with that I can make more of a decision on the SIII