Today, we're taking a peek at some downtown Austin projects in the early planning stages -- so early, in fact, that we don't have many details or images for most of them, though we can make plenty of educated guesses and maybe one of those "green box" massings we love so much, meaning you'll at least have something to look at. You might consider these the buildings "they" don't want you to know about, which isn't really true but makes this . . .