It necessarily isn't a bad thing, especially when you can get situated also with the new features right now. So if you're up to the task, you can download iOS 4.1 by simply clicking on the source link below - which again is being made available as a developer preview. Conversely, you can wait until the official release tomorrow if you feel more comfortable with doing it the normal way.
Apple iPhone 4 Specifications | Review
source: Uneasy Silence Forum via MobileCrunch