It's obvious that Blogger profiles will be discontinued and replaced by Google Profiles, but it's not clear how Blogger will integrate with Google+. Maybe Blogger posts will automatically trigger Google+ posts and Blogger/Google+ comments will be synchronized. Friend Connect will be discontinued and Google+ could replace it. Friend Connect's goal was to "help site owners easily provide social features for their visitors. Users gain the ability to sign in to, make friends on, and interact with your site, making it more social and more dynamic". It wasn't successful, but Google+ has a better chance to make Blogger more social.
Update: Blogger's blog informs that this option is available if you use Blogger in Draft and it will be released in the regular Blogger interface in the coming weeks. For now, the only changes are that the Blogger profile redirects to the Google profile, the author's name is now obtained from Google Profiles and Google's snippets for the blog posts include information about authors: name, thumbnail and link to the profile. "If you blog under a pseudonym and do not want your blog to be associated with your real name, you should not migrate from a Blogger profile to a Google+ profile," suggests Google. If you change your mind after switching to the Google+ profile, you can revert to the Blogger profile.
{ Thanks, Herin. }