It finally has a cover! I'm a bit unsure about this book - it's the first in a new series about Mia's long lost half-sister. I think I'm either going to love it or be let down, but I loved The Princess Diaries, so I'll definitely be giving this a try. It'll be fun to get back into the world, as well as Meg Cabot's writing!
Here's the (super short!) synopsis from Goodreads: In FROM THE NOTEBOOKS OF A MIDDLE SCHOOL PRINCESS a new middle grade series, readers will see Genovia, this time through the illustrated diaries of a spunky new heroine, 12 year old Olivia Grace, who happens to be the long lost half-sister of Princess Mia Thermopolis.