kentclark,
see my answer below your question.
1. What's our legal status now?
I am the primary applicant and working with EAD. My wife is working with H1-B. So are we both the I485 pending adjustees?
you are COS, your wife is H-1 and will become COS automatically if she goes to school
2. The last question in AR11: "My stay in the U.S. expires on:"
My wife has a I94 card coming with the notice of H1-B approval letter, which says I94 valid until Aug, 2005.
My EAD will expire in Jan, 2004.
your expired date is "pending on COS application process". your wife's is Aug. 2005 now and becomes as yours if she is in school.
Are those the dates I should fill in AR11?
see above answer.
3. Since my wife had an EAD before based on her practical training, it was used for a year. Then her employer applied H1B for her and she is working with H1B now. So this time she appies for EAD based on her pending I485, is this application a renewal one or a totally new one? It is asked in the beginning of I765 form.
at first she was F-1 working with EAD, than H-1. getting EAD does not change her H-1 status except she tells her employer she works under EAD on her working authorized process, a form filled by your wife and signed by employer representative.
if your wife goes to school without applying I-20, school doesn't care your wife status. search below website for more detail
http://www.immigration.gov/graphics/lawsregs/index.htm
use your last year tax return form and the evidence of current in-state address to get in-state tuition