Before I get your hopes up, no they haven't improved spreadsheets yet. However, that is on the way. What is arriving now, though, is the ability to add comments to your documents, view tables, and improved Google presentations viewing support. You'll even get speaker notes and the ability to swipe between slides.
There are more features on their way. Here at Android Police HQ, we've been eagerly awaiting proper spreadsheet editing (which is currently horrible to an unusable degree), and Google has seen fit to name check that very feature in its "More to come..." section.