I know director Joe Johnston would love to do it, but judging by the Tron movie last summer, I suspect Disney would rather reboot it with some hot, young thing as director (probably someone who directs perfume commercials and/or music videos) and some hot young cast that nobody particularly wants to pay to see. I guess I'm cynical.
Johnston is under contract for one more Marvel film (he supposedly declined to work on Captain America 2). I thought that would be a Winter Soldier spin-off of Cap, but I'm not sure that's in the cards in terms of JJ getting to do it. The Rocketeer isn't a Marvel property afik, but Disney owns Marvel now, so... there's some cross pollination there if they wanted it, I guess just in terms of Marvel and Disney being familiar with Joe.