We've had quite a few threads about this. here, here, here, etc.

From the page count, it's obvious there's going to be additional stories in both Kit and Kaya's books:

Kaya: 256 pages
Felicity: 232 pages
Josefina: 236 pages
Kirsten: 232 pages
Addy: 248 pages
Samantha: 224 pages
Kit: 256 pages
Molly: 232 pages

The two of them have the largest page counts, so most likely they are getting new stories.