We are told there are various fixes in this latest version, including fixing keyboard issues, problems with the contacts app, more changes to the phone UI, and other changes. We have heard from sources that with iOS 7.1, Apple is working very hard to address some large memory bugs and other issues in iOS 7 that have caused crashes and restarts for a lot of people. Additionally, iOS 7.1 should help unify iOS 7 better graphically, with various user interface updates across the entire system and in apps for a more cohesive feel.
So far, iOS 7.1 has brought many bug fixes, UI tweaks and performance improvements. BGR is usually a hit or a miss when it comes to iOS release dates but either way, we'll keep you updated if it is released tomorrow!