Tgara, Please don't take this the wrong way, but your wrong in your assertion that the sync working with the iPhone is Fords problem.
Yes, the MAP profile is the key to it working, but the MAP profile in question is the one that is on the iPhone, not Ford. Ford already supports the standard MAP profile used by every other cellphone manufacturer out there. Until iOS 6 the iPhone didnt have MAP profile at all. It is Apples implementation of MAP profile that is the problem.
If you also research the syncmyride forum you will see that there are many iOS developers that own Ford cars and all say that iOS6 worked flawlessly, texting and all while it was still in Beta. Apple made a change between Beta 2 and release that changed that. Pretty much sums up that it is an Apple problem.
The only other possibility is that it might be caused by a carrier instituted update that occured alongside the iOS upgrade. These updates prevent things like unlocking and taking your phone to another carrier and tethering your device to provide internet for other bluetooth devices. Some developers in Canda have reported that they do not have problems after iOS 6, it is theorized that it is because those carriers do not institute these restrictions.
There are many probolems with Apples implementation of MAP. You lose all text message audible notifications from the phone itself for one, while its connected to a bluetooth device.
The problem in reality is this. Apple always wants everyone to do things their way, and if they dont they take their toys and run. Apple is trying hard to break into the car infotainment market using SIRI. They have already signed deals with Toyota. What benefit does Apple have in using a MAP profile that will work with other car systems like Sync? None.
Apple needs to get off their butts and first admit there is aproblem publicly, which they hardly ever do, and second they need to come up with some answers and a fix pronto. With Windows phone 8 dropping next week, a lot of people will be looking very hard at it to replace their iPhone with, I know I will.