Season five already has its well known guest star tapped, Charisma Carpenter is playing the fae Freyja the norse goddess.
Interested to see how they incorporate her into the show, hopefully its good, but no holding my breath. Also included in the press release is the fact that Ksenia Solo STILL has not been confirmed as returning as Kenzi. Its looking more and more likely that she isn't coming back. Either that or Ksenia Solo is not going to be a big part of the season maybe only making a brief appearance. Also they are shooting for a fall release.