If I recall correctly, during the last furlough here, those that took the voluntary furlough were offered pass travel, insurance and a few other incentives. If you were involuntarily furloughed, you got zilch.
However, the catch was if you knew you were going to get furloughed anyway, you could opt for the voluntary furlough and still keep some of the benefits. But if you were rolling the dice and did not take the voluntary furlough, gambling that the axe wouldn't swing to your seniority, and got cut, the you were S.O.L.

I am not 100% sure if, by taking the voluntary furlough, if you were eligible for unemployment. I think those that did take it were eligible, but again, not 100% sure about that one.

Maybe they will offer the same thing this time around.