1. Not until a notice of intent to revoke is sent.
2. This case is going back to USCIS.
3. You can always get the assets back. You can try getting a tourist visa that's one way to do it. Second is to send somebody a power of attorney. You can get together with lawyers of the state where your assets are and get a proper power of attorney made out in the name of a friend. They can take care of it for you.
4. I guess in India the answer is yes. But you don't have to pay taxes both in India, as usual, there is a relief available for people in your situation, but I am not a tax expert, you need to talk to a Chartered Accountant in India. More...
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