what will be your employment status? Will you be an ex-pat working for your current employer?

Do you expect to return to USA?

You need to pay back the loan within, by law, I think 60 days after quitting. If you fail to do so by the next tax-filing deadline, it then becomes a dis-qualified withdrawal, subject to taxes and penalties.

Generally, rolling the thing to an IRA is the best thing to with the 401k.