Marshall received a two-year deal; Garza and Soto one-year contracts. The press release sent out by the Cubs said that Tom Gorzelanny also agreed to terms; I assume those terms were also agreed to by the Nationals, even though the trade of Gorzo to Washington has not formally been announced yet.
No terms were announced for any of these contracts; I assume eventually they'll leak out and when they do, if I don't post them I'm sure someone else will.
That leaves Carlos Marmol as the only unsigned arb-eligible Cub. There were reports that the team was working on a multi-year deal for Marmol as well, so I'd expect that to be finished before anything gets to a hearing with Marmol.