Contact KCC directly if your case is currently being processed there.

Yes they may depart prior to the determination and this will act as a withdrawal of the application.

You may request up to 6 months extension of your stay.

No this is not required but you can bring the payment of tickets at time of interview.

No but you can disclose at time of interview.

Best to have a lawyer assist you with a possible VAWA filing.

If you remarry you can begin the process through consular processing or prior to marriage, the Fiance visa.

You will need to wait 4 years and 9 months from the date of your residence.

Interview scheduling will likely take many months despite the upgrade of status.

Contact USCIS directly for specific guidance.