Jeopardy! has announced that from now on in regular games (ie, non-tournament), if two (or three) contestants are tied at the end of Final J!, there will be a tie-breaker question. It was announced at http://www.jeopardy.com/jbuzz/features/four-rare-jeopardy-scenarios Brian
Unless I'm missing something, this was announced a while ago. This thread dates back to November 2014, when it was just a "rumor".