They could just read all the forums from xda-developers and the like for feedback.
Nevertheless, it is good to stay on top of things, as opposed to releasing same update for all the phones and then having to deal with non-compatibility issues. Not talking about Nexus S, which is compatible, but other phones, as well.
There have been instances where updates to OS have been rolled out to older phone models, only to worsen the user experience.
It's about time to poke Google and get them to make a statement on this Nexus S update issue don't you think?? It all began about mid-December and now it is mid-January and we Nexus S owners know NOTHING. Remember to remind Google to "do good .... not bad"