It makes sense that Jensen would be there early for pre-production--scouting locations, shot lists and cast schedules, don't know if TV shows storyboard, but if it does, going over the storyboard with the production crew, etc.

But yeah, it does still seem a little early. But I guess not. June 30 is the last day of June, and I think they usually go back into production in early July (like, before the 4th?).