Blogger said in the official blog.
The new design is not only cleaner and more modern, but it also uses Google Web Toolkit, delivering the latest in web technology.So, we're really hope, blogger can release the stylish but with more less time loading too. If, you want to know some changes. Let's see the screenshot below.
Current Post Editor
New Blogger Navbar
So, we just wait. What blogger team do for the new version interface.