It looks as if that Twins sequel is moving forward.  Deadline reports that The Book of Mormon star Josh Gad and Ryan Dixon have been tapped to pen the treatment for Triplets, with Dixon handling the script.  The follow-up has Arnold Schwarzenegger and Danny DeVito reprising their roles from the 1988 comedy as mismatched siblings.  As previously reported, the follow-up will find them getting in touch with a third brother played by Eddie Murphy.  Hit the jump to see what Schwarzenegger told us about the sequel when we spoke to him on the set of the upcoming actioner The Last Stand.