As twostep mentioned, the matter of hubby being on an expat payroll vs. local payroll is more a matter of the employer's internal policies than anything having to do with immigration.
But one thing to be very careful about is your husband's green card. Depending on how long he has had it and how long he has been living outside the US, the green card may or may not be valid at this point. If you're leaving the US for more than one year, he would have had to have filed specifically for the ok to keep his green card. Otherwise it "turns into a pumpkin." I mention this only because the sister-in-law of a friend of mine has run up against this after living outside the US for several years. Her American husband is now retiring and they are returning to the US and she has to start from scratch to file for a new green card.