The only person who potentially know at this point are Pence, Gingrich and Trump and I don't think any of them are leaking.
Besides I can't imagine a rational logic tree that leads to milquetoast Pence. He's not even a good cheerleader.
He's more of a quiet, trench warfare kinda guy.
If picking him would cause SOME Evangelicals to vote for Trump, when they would not otherwise...we don't need them.
some of Trump’s closest allies haven’t heard official word it’s Pence
https://twitter.com/PhilipRucker/status/753649193902804993