The latest news on the 1.5 is that it's now in the process of final checking. We made some fixes over the weekend, and we're just giving those a last check. Assuming all's well, we'll have it wrapped up and shipped out to you guys by the end of the week.
Among the list of new features is the terrain editor, so you're no longer constrained to flat sets. Here's a couple of very quick examples of what you can do with it.