L1-A extension is in process and wife is pregnant with 6+ month.

Having a child, in and of itself, would not entitle you to an extension of your visa status.

The DS 2019 should control whether you are subject to Section 212(e) and the visa should be consistent.

I-130 withdrawal

Only the petition can withdraw an I-130. Consult an attorney.

About H1B Cap

If you would not be currently eligible for a new full six-years of H-1B status, it is possible.

I am married to USA citizen and I have my green card and she want to give me divorce.

If you are not living with a US Citizen spouse, you can file 4 years and nine months from the date you were admitted as a lawful permanent resident.

Can I revoke my wife's h4 visa. ...

If you obtain a divorce, your wife would no longer be entitled to H-4 status.

Do J2 spouse of a physician have to leave the country in J1 has joined MAVNI and not fullfilled 3 yr J1 waiver reuirments

J-2 status is contingent on the status of the J-1.

He will be found inadmissible to the US at his interview, at which time he will be required to file his waiver application(s) and submit an I-212.

Filling i765 form for Optional Practice Training(OPT)

You should answer the inquiry truthfully and completely. Consult with an immigration attorney for specific guidance.

Is there any regulation regarding to apply for visitor visa for cases under I-130 process.

They can apply for a visitor's visa but it wouid most likely be denied under those circumstances.