Google promised a new Blogger interface back in March and started a imperfect test in April. "The new design is not only cleaner and more modern, but it also uses Google Web Toolkit, delivering the newest in web technology."
The new interface is now obtainable in Blogger in Draft, but it looks quite different. "Over the last couple of months, we've made important improvements to our new user interface. First and foremost, we've incorporated your feedback and made many fixes based on that feedback. Also, we've rationalized the look and feel of our new design, inspired by Google's newest design evolutions," explains Google. Blogger uses Ajax, so all the pages load a lot faster, including the post editor. Unfortunately, Blogger is still very slow when you carry out a search and try to display posts or comments.
Blogger's new UI is cleaner and it offers added information about your posts: the number of page views. Tabs have been replaced by a upright menu and the list of labels is now a drop-down. The post editor is much better, particularly if you use the default view. Blogger's new editor takes up most of the page and post settings are now incorporated in a sidebar.
There's a lot of white space in the new border, buttons aren't big enough to be legible and Blogger includes too much information that's not very useful: the total number of published comments and the total number of page views. The new interface is a mixed bag: it's modern, clean, faster and more powerful, but there are many belongings that need to be changed before replacing the accessible interface.
You can try the new UI at draft.blogger.com and you also have the alternative to make it the default interface.