On the plane, you can have 9,999 us. 10k is a problem. But even then 9999us can be looked at as evasion. Better to have 9500 or something less. You and your wife can have 9999 each.
Also, the deduction is 92k us per person, and hence married filing jointly can get 184k. Its going up to 95 or 96k each I believe too.
Yes but starting 2013 tax year. you must live in HK the entire tax year.
You can add housing too. So 92k + 92k + 25k housing.....etc. Housing is the "extra" amount you pay for residing overseas.