First off, I don't have an iphone so I may be way off on this. As I understand it with the new updates you can access SIRI. (I use a android)..
So assuming that I had an iPhone...and you guys with them can answer I am sure.
So I am riding, I ask SIRI for directions etc, will I get the directions dictated to me turn by turn, or does the bike only let SIRI answer one question and then it shuts off. I think it would be handy to use the phone as a back up for information etc on my long trips, but do you really get the full functionality with SIRI or does the phone cut off after answering your question...

Also any rumors about google compatibility with asking google questions for future upgrades ?

 

First, you have to make sure your iPhone is unlocked. Siri will not do anything if your phone is locked except tell you to unlock it.

you can tell Siri to "Take me home" for example, and it should open navigation. However, you will need to press the button on your phone's screen (which can be dangerous) to begin the route in order for you to get turn by turn notifications.
None of this can happen without a 7-pin communication wired headset.