I did some research on the Mind-Bond Through Force subject, because there are several new canon books (where the story develops better than in the movies, for obvious reasons) and apparently, despite what Johnson says, it is NOT a new concept within the Universe. There are two fairly long articles about it on Wookiepedia here: http://starwars.wikia.com/wiki/Force-bond and it'sWookieepedia, divided in Canon and Legends (R.I.P.).
Being objective and keeping it within the new canon, it's definitely happened before (yeah, that's how much Johnson actually knows about what he attempted to write...) and mentions the mind-bond between Ezra and Darth Maul in the Rebels animation. It also mentions a bond between Master Yoda and his former apprentice, Count Dooku (a.k.a. Darth Tyranus). If you're really curious, I recommend you read both articles, they give you "real" examples of how the bonds happen and how can one side or the other manipulate it to instill determined emotions on the other party or pass on feelings and messages (like in ANH, as cited above).