My next book, Lessons in Stoicism, is a short popular guide to Stoicism aimed at a wide audience. It goes through a number of key themes in Stoicism, focusing on the Roman Stoics and introducing the Roman Stoics as individuals along the way.
It will be published by Penguin in September 2019. North American rights and translations rights for a couple of languages have already been sold. Right now copyediting and the cover are being finalized.
There's some further information here.