I do understand you are looking forward to more features from Nokia. But at this point of time, I will prefer to have a stable version first since 8.1 is really a massive update which MS released ever for Windows Phone. They are laying the ground work for future updates. Who knows the brightness control will come eventually? In fact, I hope that the volume sliders will be displayed on the action center as well because it is hidden quite deep within the OS.
Anyways, is cool. We are all excited about the updates for sure. Expectations are everywhere.
The cyan firmware is meant to make the OS stable, yes. But by reading the comments in the forum it seems that the cyan firmware makes the OS no more stable than the developer preview was in the first place. The popping while scrubbing in videos was an instability which wasn't addressed in the cyan update. One person reported glance refusing to load from his settings after cyan was installed. I think that this was a premature release, and I think that MS pulled it because I heard one person saying that they got an update, but couldn't download it cause of battery low message. Then after the phone charged, they checked again and no update. I also think that the update that was done to the dev preview (12400) was a test at a fix for those experiencing issues with cyan (although no one with cyan got the update, it's likely that they will because anything that goes on dev preview is usually ore release consumer software).
Maybe this dev preview update also got pulled because of some bugs or something, because by the time I got onto WiFi there was no update to be found. MS pulled this one too.
I don't know what is happening but my guess is that cyan didn't work as expected, MS pulled the update, dev preview got a pre release of the wp8.1 update which might help cyan work better, there was something wrong with that update, MS pulled that one too.
So I hope that all devices get one final update to level everything now. Coz now we have people on wp8.0, we have people on dev preview 12397, we have people on wp8.1 12397 with lumia cyan, and we have people on dev preview 12400.
I hope MS fixes what is wrong if there is anything wrong, and gives everyone a new version of wp8.1, maybe 12450?? Or something to level it out a bit. Because its a bit of a mess at the moment