From everything I've been able to find, the 2009 Rio will be exactly the same as the 2008 model, maybe a couple of different options. There will be a hybrid but that's only for Korea for now.
Hyundai has developed a new platform for the Getz/Accent though which is due out in the 2009 model year, so maybe we could be surprised with a new Rio?
Here's an older article concerning the new Hyundai platform:
Future Kia Rio shares i20 platform! | Kia Forums and Kia Blog
Maybe check with your local Kia dealer, they might be able to tell you if a new model ix coming and when to expect it.