MLB Daily Dish has a nice, handy chart running down which free agents were offered arbitration, which weren't, and the classification of each free agent.
The next deadline is December 12, which is the deadline for tendering arbitration to non-free-agent players. The Rangers' group of arb-eligibles consists of Scott Feldman, Josh Hamilton, Frankie Francisco, C.J. Wilson, Dustin Nippert, Brandon McCarthy, and Esteban German, and everyone other than German should end up being tendered.
However, on December 12, there will be some decent players that will end up getting non-tendered and thus join the free agent pool, and I think that, given the Rangers' situation, you could see them pursuing some of those guys once they are on the market.