The first beta of 5.0.3 is out now. You can download it here. It's got fixes for syncing, sending to blogs, adding tags, automatic lists, and a few UI-related areas. There are plenty of small fixes across the app. Let me know of any problems you have with this build.
Please note that this is a beta build, not a final release. Beta builds have an expiration date to make sure they aren't used forever, while final builds do not have such an expiration date.