All, we here at iBOLT are starting to get a bettter grasp on the missing car-mode and aux-out features in Jellybean when used with a car-dock. Based on our current understanding (please correct this if anyone know anything different...) the following is the situation:
1. For any Jellybean formally released by any US or Canadian Carrier the car-mode and aux-out will work properly, this was proven when Sprint launched the Jellybean version a few weeks ago. The upcoming release for AT&T, Verizon and others will also have these features properly incorporated. This means that if you have a car-dock, type the iBOLT version we are offering for sale online or in Verizon stores you can safely continue to use it or buy it if you have not yet. So essentially it appears that Samsung US (headquarter in TX) is on the ball and know what they are doing so let's not yell at them anymore...
2. The International version of S III is essentially a completely different phone as it's using a different processor and is even slightly different in size. The firmware implemented in this version is derived from the Polish JB version, where Samsung has a big software Team. That is also why the Polish version is 1st out when new JB releases starts rolling out. As the development of this JB version is done independently from the US version they have different feature sets. Many US consumers have purchased an unlocked phone, which would by default use a European firmware update instead of US carrier specific. Many US advanced users have also rooted their phones and are downloading the Polish/German/UK version of JB, or a non-official version of some kind and they are pretty much without exception missing the car-mode and aux-out feature set. Based on multiple contacts with Samsung customer support representatives in Europe we have high hopes Samsung Poland will turn these features on again in the next release but no guarantees of course.
I hope the above makes sense? A lot of information with good news for North American drivers and "please hold" for our European friends