You book theme come with several new options as :

1- sign in page : you can put any image to sign in page background ( nice to close websites require log in first )

2- sign up page : new design for sign up page with side image or you can put  video instead ( see attach preview photo ) .

3- new console and new alert count .

4- new chat design and new chat new message alert .

5- new group, event list page, members list page .

6- side main menu .

and more