Good news! The Infected Update has been released on Xbox One. We were able to follow the Steam release much more rapidly this time. We won’t always be able to do that, but we will try to keep it up!
Check out the Infected Update site to see all the goodies included in the Infected Update.
With regards to performance and save/load issues: The Infected Update is not a silver bullet that brings great FPS and reliable save/load. Performance is an ongoing effort, and we are still researching the save/load issue in an effort to full resolve it. Here are two posts talking about these topics: