[Zaim3]

The T-Mobile Nexus S you're referring to had its 4.0.3 OTA pulled within the same month it was released due to mass complaints with Android OS wakelocks/battery drain, instability and other misc things.

For 3 months after that, even their current flagship the yakju Galaxy Nexus was stuck on an "old" version of Android 4.0.2 whilst they worked on a fixed version of 4.0.3 which they eventually shipped in March as 4.0.4.

While I'm not saying you should be pleased at the complete lack of communication/respect given to you, I think their decision to stick with an older, stable version of the OS on the Nexus S 4G as opposed to pushing an update they knew was broken was the correct one.