Though word on the project has been mum for some time now, it appears that Columbia Pictures is still bullish on a sequel to the 2010 spy thriller Salt.  Back in June of last year, the studio hired the first film’s scribe, Kurt Wimmer, to start working on a follow-up to the Phillip Noyce-helmed thriller.  After reports that star Angelina Jolie wasn’t too keen on the existing script for the sequel and thus had yet to sign on, THR now reports that Becky Johnston has been brought in to reconceive the script.Johnston is probably best known for penning the 1991 romantic drama The Prince of Tides as well as the 1997 Brad Pitt-starrer Seven Years in Tibet.  There’s no firm word on what the follow-up will entail, but the first film involved a CIA officer played by Jolie who discovered that she was actually a Russian sleeper cell agent.  Noyce has already declined to return for the sequel, and Jolie’s involvement will hinge on how Johnston’s script turns out.  It’s clear, though, that Columbia is keen on getting this follow-up going.