Didn't they say we will hear about the Expansion at the Fan Fest?

[Omegakiyohime]

It's a live letter, the fan fest won't be only this.

Pretty much this. The expansion will more than likely get it's own big announcement at the Fan fest. Although, if they do anything like XI fanfests did, the information no matter how little it is, will likely be spread throughout the 3 i.e. We'll get a title, location, and maybe Yugiri's race at the NA one, a job at the EU one and a Job at the japan one. I doubt it will be that much information combined in the the end.