Any more HxH stories or episodes out there? I've watched all 148 episodes of the Hunter x Hunter anime, and even the movie "The Last Mission." Now I want to know if there is anything else to watch? Are there any more movies, or maybe some new episodes coming out?
The 2011 series covers roughly chapters 1 to 339 of the manga, as documented in this answer by Frosteeze.

Since then, 21 new chapters have been released (as of september 2016, see here or here).

Update: As The Pickle Tickler mentions, "it has been announced that the manga is getting a continuation in 2016, as stated here."

In addition to "The Last Mission", another anime film was released in 2013, "Phantom Rouge".

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Other than that, you have the original 1999 series, a set of 30 OVA episodes, and a 1998 short film, "Jump Super Anime Tour 98". None of them include material not covered by the 2011 series, as far as I know.