During the Kickstarter for Friday The 13th: The Game one of the core selling points was that the game was supposed to have a single-player story mode available for those who backed the game. Unfortunately, things haven't quite worked out just yet and the game still doesn't have a single-player story mode.
The forum features more than just explanations (or excuses, if you're an angry backer), there's also a roadmap for the game that reveals all the DLC that Illfonic and Gun Media have planned for the game. It starts with a free clothing pack and ends with a new map. In between, we see all the various other updates planned.
It looks like the single-player content won't be made available until after Halloween but before winter gets here. Unfortunately, the single-player won't be the full version. The roadmap reveals that there's only going to be a single-player challenges demo, along with offline bots, set to arrive just ahead of that.
Between that time and the actual single-player mode there will be new maps, new skins, new clothing and a new Jason skin.
Gertz explains that forcing gamers to have to wait as long as they have for the single-player was inconvenient enough, so in order to make things go by a lot faster Illfonic is hiring some more staff...
So we can assume the "experience" that Gertz is talking about is the single-player challenges that will release this fall.