All content from the first edition of the book is still relevant -- all code examples will run -- except for the appendix about installing software.
I'm working on a 2nd edition that will cover the latest techniques and APIs -- possible release at the end of 2019 or early 2020.
In general, the new APIs *extend* prior Keras workflows rather than upending them -- in particular they make Keras completely flexible and extensible for the needs of deep learning researchers. Prior high-level workflows are still relevant.
As a new user, you won't see a huge difference in the Keras experience in TensorFlow 2.0. But as a researcher, you'll get access to entirely new workflows and features to work more productively.
You can follow @fchollet.
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