Well, after checking some more, I am back to iOS 6 as the beta or pre-beta or the developer preview of iOS 7 is not really usable as it stands.
For one, it does not sync notes and calendars. Events are not marked out on the calendars that you can see at a glance. Besides other issues, It also has problems with notifications. The UI changes will make a large number of existing apps practically unusable. The battery life is also down substantially.
So, I would agree with the term used by the Apple iOS developer site and say that this is just a developer preview (DP) and not a beta as mentioned in the WWDC 2013.
iOS 7 DP takes a lot more space to display the same information as iOS 6 and the folders also shows lesser apps than in iOS 6. In short, the iOS 6 UI is far more efficient in normal usage. The lack of visual indicators in iOS 7, specially considering the high resolution retina display, is definitely a step backwards. The text, on the other hand, seems to be far better done in iOS 7.
If you are like me and organise your apps into folders, then, iOS 7 can look really terrible compared to iOS 6. You cannot really make out the icons inside the folders. If that was not enough, the transparency also contributes to making it illegible. There is also the issue of the bright, new icons. Now, you would be hard pressed to figure out between a variety of apps. For example, I could no longer just pick out between “Photos”, “NewsStand” and “Game Center” offhand like in iOS 6. Now I have to squint to figure it out. Of course, since I organise the apps into folders, I would know which is where, but, just looking at these app icons, you really need to squint, more so if you have a white wallpaper/background.
The all new FaceTime application I mentioned earlier, is actually the older Contacts app. It is simply renamed to FaceTime with a new icon and UI.
I came across an interesting comparison related to the “all new” iOS 7 “design” at “iOS 7 looks familiar – can’t quite put my finger on it“. Although Apple is known to “pick up” features from jailbreak tweaks in the past, this one is really interesting!
Let’s wait and see what the actual iOS 7 beta would look and feel like…