I have just downloaded OS6 onto my 4S and am in the process of playing with it. When you consider that OS6 - and all of its improvements/advantages is now available to earlier models, it makes the benefits of an iPhone 5 even less necessary. I wonder whether Siri will now run on the 3GS and 4 models? The first thing that I notice is that the improvements to Siri are not applicable in Australia - she still can't give local advice.
It is a very big download - I had to delete some music to clear the two point five GB demanded by the installer. Once installed however, some of the memory is returned - but not all of it. I like the new turn by turn mapping option - a shame that I had already forked out close to one hundred dollars for a commercial version.
I am off to play with it some more.