What is the difference between Magento CE 2.1.4 and 2.1.5?
Which bugs are solved in Magento CE2.1.5?
What are the differences with previous Magento CE?
There are not any functional bug resolved in Magento 2.1.5
Only Difference is updates of copyright date in each file.
See Comment from Magento devdocs file,
This release updates the copyright date in every file. It does not contain any functional changes or security improvements. Isolating these changes in a single release is intended to simplify future updates and developer workflow.
From Magento 2.1.5,
Only Date changes in every file of magento source, You can check it in every file with comment of copyright date start with something like below,
<?php /** * Copyright © 2013-2017 Magento, Inc. All rights reserved. * See COPYING.txt for license details. */
You can check it in magento 2.1.4 file with copyright date as below,
<?php /** * Copyright © 2016 Magento. All rights reserved. * See COPYING.txt for license details. */