Essentially, slides have variable height now. This is not normally visible, but with transitions that have a non-transparent background, like `cube` or `page`, it is:
http://lab.hakim.se/reveal-js/?transition=cube
Before, slides had a fixed height, which means that presentations designed with that assumption in mind will look very different now.
Another aspect that I bumped into is that I used the slide's height to dynamically size images to fill the remainder of the space from the heading to the footer, like this (stripped to the essence):
bigImage.style.height = section.offsetHeight - bigImage.offsetTop + 'px';
Alternatively, is there an easy way to restore the previous functionality?
Dan Dascalescu