Nobody knows for sure yet, but I'd say this is a no. Bungie usually sticks to a theme when designing Halo maps, and a dingy doesn't really fit the Forerunner theme Bungie has going on with Forge World. However great it would be for some mini-game map creators, it's not likely to happen. This thread wasn't neccessary to be made by the way, you could have just posted this in the stickied discussion thread. Inb4lock.
Already been said that it's highly unlikely for it to be in. Depending on what other movable objects we have you can use any movable object preferably flat and it will have the same effect just wont be as visually as appealing.