Dunno if it's for leverage, but the guy has seriously left himself a ton of outs. For all his "clearly" and "obviously" language on other topics, he's less than emphatic about the clarity of his future.
That's exactly what he should do in his position. Fewer outs is rarely a good thing in business.
I'm sure he's had this discussion with his agent about what to say when these questions come. He answers it the same way everytime. He loves it here, his family loves it, putting together a great recruiting class etc. This is the first time someone came out and directly asked him if he was going to coach here next year. Him saying "I believe" I'm going to be the coach makes me nervous