1.3 added the entire main story Season 2 Episode 3, as well as 1 more secret character and a few side story scenes. Make sure you have 1.3.0.4.
Also if your save is from one of the beta versions (before July, version 0.x.x.x), be advised your save won't work with the full release version (version 1.0+). If you have a beta save, due to finalizing backend systems, you'll have to start over one last time. Thankfully, because this is the full release, there will be no more restarts, as backend systems have been finalized and there should be no new system critical variables.