I’m not sure if this is their last release of TF1 before supporting mainly TF2

From the release notes:

This is the first 1.x release containing the compat.v2 module. This module is required to allow libraries to publish code which works in both 1.x and 2.x. After this release, no backwards incompatible changes are allowed in the 2.0 Python API.

https://github.com/tensorflow/tensorflow/releases/tag/v1.14.0-rc0