Since Ubuntu phone gonna hit the market very soon, I was wondering if there's gonna be separate forum for Ubuntu phone or AskUbuntu will do the job?
The FAQ states (as on-topic):
Using and administering Ubuntu, including official Ubuntu derivatives.
I also think the Ubuntu Phone will not be a big enough topic to create a new Stack Exchange site or forum about.
However, the FAQ also states (as off-topic):
Issues with the next version of Ubuntu (Ubuntu+1) (More information about Alpha and Beta release issues).
So discussing this topic, e.g. hardware support, development, etc, would probably be considered off-topic right now.